diff --git a/code/AssetLib/3DS/3DSHelper.h b/code/AssetLib/3DS/3DSHelper.h
index 1930c0c40..e8efbf949 100644
--- a/code/AssetLib/3DS/3DSHelper.h
+++ b/code/AssetLib/3DS/3DSHelper.h
@@ -348,16 +348,16 @@ struct Texture {
         // empty
     }
 
-    Texture(Texture &&other) AI_NO_EXCEPT : mTextureBlend(std::move(other.mTextureBlend)),
+    Texture(Texture &&other) AI_NO_EXCEPT : mTextureBlend(other.mTextureBlend),
                                             mMapName(std::move(other.mMapName)),
-                                            mOffsetU(std::move(other.mOffsetU)),
-                                            mOffsetV(std::move(other.mOffsetV)),
-                                            mScaleU(std::move(other.mScaleU)),
-                                            mScaleV(std::move(other.mScaleV)),
-                                            mRotation(std::move(other.mRotation)),
-                                            mMapMode(std::move(other.mMapMode)),
-                                            bPrivate(std::move(other.bPrivate)),
-                                            iUVSrc(std::move(other.iUVSrc)) {
+                                            mOffsetU(other.mOffsetU),
+                                            mOffsetV(other.mOffsetV),
+                                            mScaleU(other.mScaleU),
+                                            mScaleV(other.mScaleV),
+                                            mRotation(other.mRotation),
+                                            mMapMode(other.mMapMode),
+                                            bPrivate(other.bPrivate),
+                                            iUVSrc(other.iUVSrc) {
         // empty
     }
 
@@ -366,16 +366,16 @@ struct Texture {
             return *this;
         }
 
-        mTextureBlend = std::move(other.mTextureBlend);
+        mTextureBlend = other.mTextureBlend;
         mMapName = std::move(other.mMapName);
-        mOffsetU = std::move(other.mOffsetU);
-        mOffsetV = std::move(other.mOffsetV);
-        mScaleU = std::move(other.mScaleU);
-        mScaleV = std::move(other.mScaleV);
-        mRotation = std::move(other.mRotation);
-        mMapMode = std::move(other.mMapMode);
-        bPrivate = std::move(other.bPrivate);
-        iUVSrc = std::move(other.iUVSrc);
+        mOffsetU = other.mOffsetU;
+        mOffsetV = other.mOffsetV;
+        mScaleU = other.mScaleU;
+        mScaleV = other.mScaleV;
+        mRotation = other.mRotation;
+        mMapMode = other.mMapMode;
+        bPrivate = other.bPrivate;
+        iUVSrc = other.iUVSrc;
 
         return *this;
     }
@@ -461,13 +461,13 @@ struct Material {
 
     //! Move constructor. This is explicitly written because MSVC doesn't support defaulting it
     Material(Material &&other) AI_NO_EXCEPT : mName(std::move(other.mName)),
-                                              mDiffuse(std::move(other.mDiffuse)),
-                                              mSpecularExponent(std::move(other.mSpecularExponent)),
-                                              mShininessStrength(std::move(other.mShininessStrength)),
-                                              mSpecular(std::move(other.mSpecular)),
-                                              mAmbient(std::move(other.mAmbient)),
-                                              mShading(std::move(other.mShading)),
-                                              mTransparency(std::move(other.mTransparency)),
+                                              mDiffuse(other.mDiffuse),
+                                              mSpecularExponent(other.mSpecularExponent),
+                                              mShininessStrength(other.mShininessStrength),
+                                              mSpecular(other.mSpecular),
+                                              mAmbient(other.mAmbient),
+                                              mShading(other.mShading),
+                                              mTransparency(other.mTransparency),
                                               sTexDiffuse(std::move(other.sTexDiffuse)),
                                               sTexOpacity(std::move(other.sTexOpacity)),
                                               sTexSpecular(std::move(other.sTexSpecular)),
@@ -475,10 +475,10 @@ struct Material {
                                               sTexBump(std::move(other.sTexBump)),
                                               sTexEmissive(std::move(other.sTexEmissive)),
                                               sTexShininess(std::move(other.sTexShininess)),
-                                              mBumpHeight(std::move(other.mBumpHeight)),
-                                              mEmissive(std::move(other.mEmissive)),
+                                              mBumpHeight(other.mBumpHeight),
+                                              mEmissive(other.mEmissive),
                                               sTexAmbient(std::move(other.sTexAmbient)),
-                                              mTwoSided(std::move(other.mTwoSided)) {
+                                              mTwoSided(other.mTwoSided) {
         // empty
     }
 
@@ -488,13 +488,13 @@ struct Material {
         }
 
         mName = std::move(other.mName);
-        mDiffuse = std::move(other.mDiffuse);
-        mSpecularExponent = std::move(other.mSpecularExponent);
-        mShininessStrength = std::move(other.mShininessStrength),
-        mSpecular = std::move(other.mSpecular);
-        mAmbient = std::move(other.mAmbient);
-        mShading = std::move(other.mShading);
-        mTransparency = std::move(other.mTransparency);
+        mDiffuse = other.mDiffuse;
+        mSpecularExponent = other.mSpecularExponent;
+        mShininessStrength = other.mShininessStrength,
+        mSpecular = other.mSpecular;
+        mAmbient = other.mAmbient;
+        mShading = other.mShading;
+        mTransparency = other.mTransparency;
         sTexDiffuse = std::move(other.sTexDiffuse);
         sTexOpacity = std::move(other.sTexOpacity);
         sTexSpecular = std::move(other.sTexSpecular);
@@ -502,10 +502,10 @@ struct Material {
         sTexBump = std::move(other.sTexBump);
         sTexEmissive = std::move(other.sTexEmissive);
         sTexShininess = std::move(other.sTexShininess);
-        mBumpHeight = std::move(other.mBumpHeight);
-        mEmissive = std::move(other.mEmissive);
+        mBumpHeight = other.mBumpHeight;
+        mEmissive = other.mEmissive;
         sTexAmbient = std::move(other.sTexAmbient);
-        mTwoSided = std::move(other.mTwoSided);
+        mTwoSided = other.mTwoSided;
 
         return *this;
     }
diff --git a/code/AssetLib/ASE/ASEParser.h b/code/AssetLib/ASE/ASEParser.h
index d04fc0662..f49cfc36f 100644
--- a/code/AssetLib/ASE/ASEParser.h
+++ b/code/AssetLib/ASE/ASEParser.h
@@ -95,8 +95,8 @@ struct Material : public D3DS::Material {
     Material(Material &&other) AI_NO_EXCEPT
             : D3DS::Material(std::move(other)),
               avSubMaterials(std::move(other.avSubMaterials)),
-              pcInstance(std::move(other.pcInstance)),
-              bNeed(std::move(other.bNeed)) {
+              pcInstance(other.pcInstance),
+              bNeed(other.bNeed) {
         other.pcInstance = nullptr;
     }
 
@@ -108,8 +108,8 @@ struct Material : public D3DS::Material {
         //D3DS::Material::operator=(std::move(other));
 
         avSubMaterials = std::move(other.avSubMaterials);
-        pcInstance = std::move(other.pcInstance);
-        bNeed = std::move(other.bNeed);
+        pcInstance = other.pcInstance;
+        bNeed = other.bNeed;
 
         other.pcInstance = nullptr;
 
diff --git a/code/AssetLib/B3D/B3DImporter.cpp b/code/AssetLib/B3D/B3DImporter.cpp
index 3d9a5075a..11f7bcd14 100644
--- a/code/AssetLib/B3D/B3DImporter.cpp
+++ b/code/AssetLib/B3D/B3DImporter.cpp
@@ -143,7 +143,7 @@ AI_WONT_RETURN void B3DImporter::Oops() {
 }
 
 // ------------------------------------------------------------------------------------------------
-AI_WONT_RETURN void B3DImporter::Fail(string str) {
+AI_WONT_RETURN void B3DImporter::Fail(const string &str) {
 #ifdef DEBUG_B3D
     ASSIMP_LOG_ERROR("Error in B3D file data: ", str);
 #endif
diff --git a/code/AssetLib/B3D/B3DImporter.h b/code/AssetLib/B3D/B3DImporter.h
index e2a75abdf..a7ed65c3b 100644
--- a/code/AssetLib/B3D/B3DImporter.h
+++ b/code/AssetLib/B3D/B3DImporter.h
@@ -96,7 +96,7 @@ private:
     };
 
     AI_WONT_RETURN void Oops() AI_WONT_RETURN_SUFFIX;
-    AI_WONT_RETURN void Fail( std::string str ) AI_WONT_RETURN_SUFFIX;
+    AI_WONT_RETURN void Fail(const std::string &str) AI_WONT_RETURN_SUFFIX;
 
     void ReadTEXS();
     void ReadBRUS();
diff --git a/code/AssetLib/Blender/BlenderLoader.cpp b/code/AssetLib/Blender/BlenderLoader.cpp
index 7cf4e070e..42a7a1723 100644
--- a/code/AssetLib/Blender/BlenderLoader.cpp
+++ b/code/AssetLib/Blender/BlenderLoader.cpp
@@ -679,7 +679,7 @@ void BlenderImporter::BuildMaterials(ConversionData &conv_data) {
 
     BuildDefaultMaterial(conv_data);
 
-    for (std::shared_ptr<Material> mat : conv_data.materials_raw) {
+    for (const std::shared_ptr<Material> &mat : conv_data.materials_raw) {
 
         // reset per material global counters
         for (size_t i = 0; i < sizeof(conv_data.next_texture) / sizeof(conv_data.next_texture[0]); ++i) {
diff --git a/code/AssetLib/COB/COBLoader.cpp b/code/AssetLib/COB/COBLoader.cpp
index 94327c683..822bce16d 100644
--- a/code/AssetLib/COB/COBLoader.cpp
+++ b/code/AssetLib/COB/COBLoader.cpp
@@ -230,7 +230,7 @@ void COBImporter::InternReadFile(const std::string &pFile, aiScene *pScene, IOSy
 }
 
 // ------------------------------------------------------------------------------------------------
-void ConvertTexture(std::shared_ptr<Texture> tex, aiMaterial *out, aiTextureType type) {
+void ConvertTexture(const std::shared_ptr<Texture> &tex, aiMaterial *out, aiTextureType type) {
     const aiString path(tex->path);
     out->AddProperty(&path, AI_MATKEY_TEXTURE(type, 0));
     out->AddProperty(&tex->transform, 1, AI_MATKEY_UVTRANSFORM(type, 0));
diff --git a/code/AssetLib/Collada/ColladaParser.cpp b/code/AssetLib/Collada/ColladaParser.cpp
index 5dbf0a567..3166136b2 100644
--- a/code/AssetLib/Collada/ColladaParser.cpp
+++ b/code/AssetLib/Collada/ColladaParser.cpp
@@ -453,7 +453,7 @@ void ColladaParser::PostProcessRootAnimations() {
 
         temp.mSubAnims.push_back(clip);
 
-        for (std::string animationID : it.second) {
+        for (const std::string &animationID : it.second) {
             AnimationLibrary::iterator animation = mAnimationLibrary.find(animationID);
 
             if (animation != mAnimationLibrary.end()) {
diff --git a/code/AssetLib/FBX/FBXConverter.cpp b/code/AssetLib/FBX/FBXConverter.cpp
index a564b3e9b..a6a3fc566 100644
--- a/code/AssetLib/FBX/FBXConverter.cpp
+++ b/code/AssetLib/FBX/FBXConverter.cpp
@@ -2599,7 +2599,7 @@ void FBXConverter::ConvertAnimationStack(const AnimationStack &st) {
             anim->mMorphMeshChannels = new aiMeshMorphAnim *[numMorphMeshChannels];
             anim->mNumMorphMeshChannels = numMorphMeshChannels;
             unsigned int i = 0;
-            for (auto morphAnimIt : morphAnimDatas) {
+            for (const auto &morphAnimIt : morphAnimDatas) {
                 morphAnimData *animData = morphAnimIt.second;
                 unsigned int numKeys = static_cast<unsigned int>(animData->size());
                 aiMeshMorphAnim *meshMorphAnim = new aiMeshMorphAnim();
diff --git a/code/AssetLib/FBX/FBXDocument.cpp b/code/AssetLib/FBX/FBXDocument.cpp
index 7adaadf6c..0c4435348 100644
--- a/code/AssetLib/FBX/FBXDocument.cpp
+++ b/code/AssetLib/FBX/FBXDocument.cpp
@@ -57,9 +57,10 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include <assimp/DefaultLogger.hpp>
 
-#include <memory>
 #include <functional>
 #include <map>
+#include <memory>
+#include <utility>
 
 namespace Assimp {
 namespace FBX {
@@ -248,10 +249,8 @@ Object::~Object()
 }
 
 // ------------------------------------------------------------------------------------------------
-FileGlobalSettings::FileGlobalSettings(const Document& doc, std::shared_ptr<const PropertyTable> props)
-: props(props)
-, doc(doc)
-{
+FileGlobalSettings::FileGlobalSettings(const Document &doc, std::shared_ptr<const PropertyTable> props) :
+        props(std::move(props)), doc(doc) {
     // empty
 }
 
diff --git a/code/AssetLib/FBX/FBXExportNode.cpp b/code/AssetLib/FBX/FBXExportNode.cpp
index 91e421420..817308ec8 100644
--- a/code/AssetLib/FBX/FBXExportNode.cpp
+++ b/code/AssetLib/FBX/FBXExportNode.cpp
@@ -144,9 +144,8 @@ void FBX::Node::AddP70time(
 // public member functions for writing nodes to stream
 
 void FBX::Node::Dump(
-    std::shared_ptr<Assimp::IOStream> outfile,
-    bool binary, int indent
-) {
+        const std::shared_ptr<Assimp::IOStream> &outfile,
+        bool binary, int indent) {
     if (binary) {
         Assimp::StreamWriterLE outstream(outfile);
         DumpBinary(outstream);
diff --git a/code/AssetLib/FBX/FBXExportNode.h b/code/AssetLib/FBX/FBXExportNode.h
index c5f29ef0f..6ef27972d 100644
--- a/code/AssetLib/FBX/FBXExportNode.h
+++ b/code/AssetLib/FBX/FBXExportNode.h
@@ -157,9 +157,8 @@ public: // member functions for writing data to a file or stream
 
     // write the full node to the given file or stream
     void Dump(
-        std::shared_ptr<Assimp::IOStream> outfile,
-        bool binary, int indent
-    );
+            const std::shared_ptr<Assimp::IOStream> &outfile,
+            bool binary, int indent);
     void Dump(Assimp::StreamWriterLE &s, bool binary, int indent);
 
     // these other functions are for writing data piece by piece.
diff --git a/code/AssetLib/FBX/FBXExporter.cpp b/code/AssetLib/FBX/FBXExporter.cpp
index 6bdd0b5be..27b65a27f 100644
--- a/code/AssetLib/FBX/FBXExporter.cpp
+++ b/code/AssetLib/FBX/FBXExporter.cpp
@@ -2718,16 +2718,14 @@ void FBXExporter::WriteModelNodes(
     }
 }
 
-
 void FBXExporter::WriteAnimationCurveNode(
-    StreamWriterLE& outstream,
-    int64_t uid,
-    const std::string& name, // "T", "R", or "S"
-    aiVector3D default_value,
-    std::string property_name, // "Lcl Translation" etc
-    int64_t layer_uid,
-    int64_t node_uid
-) {
+        StreamWriterLE &outstream,
+        int64_t uid,
+        const std::string &name, // "T", "R", or "S"
+        aiVector3D default_value,
+        const std::string &property_name, // "Lcl Translation" etc
+        int64_t layer_uid,
+        int64_t node_uid) {
     FBX::Node n("AnimationCurveNode");
     n.AddProperties(uid, name + FBX::SEPARATOR + "AnimCurveNode", "");
     FBX::Node p("Properties70");
@@ -2742,7 +2740,6 @@ void FBXExporter::WriteAnimationCurveNode(
     this->connections.emplace_back("C", "OP", uid, node_uid, property_name);
 }
 
-
 void FBXExporter::WriteAnimationCurve(
     StreamWriterLE& outstream,
     double default_value,
diff --git a/code/AssetLib/FBX/FBXExporter.h b/code/AssetLib/FBX/FBXExporter.h
index 2b751ea26..d249b7bee 100644
--- a/code/AssetLib/FBX/FBXExporter.h
+++ b/code/AssetLib/FBX/FBXExporter.h
@@ -154,14 +154,13 @@ namespace Assimp {
             FBX::TransformInheritance ti_type=FBX::TransformInheritance_RSrs
         );
         void WriteAnimationCurveNode(
-            StreamWriterLE& outstream,
-            int64_t uid,
-            const std::string& name, // "T", "R", or "S"
-            aiVector3D default_value,
-            std::string property_name, // "Lcl Translation" etc
-            int64_t animation_layer_uid,
-            int64_t node_uid
-        );
+                StreamWriterLE &outstream,
+                int64_t uid,
+                const std::string &name, // "T", "R", or "S"
+                aiVector3D default_value,
+                const std::string &property_name, // "Lcl Translation" etc
+                int64_t animation_layer_uid,
+                int64_t node_uid);
         void WriteAnimationCurve(
             StreamWriterLE& outstream,
             double default_value,
diff --git a/code/AssetLib/FBX/FBXProperties.cpp b/code/AssetLib/FBX/FBXProperties.cpp
index 1a5ebffd1..c3f4de260 100644
--- a/code/AssetLib/FBX/FBXProperties.cpp
+++ b/code/AssetLib/FBX/FBXProperties.cpp
@@ -52,6 +52,8 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "FBXDocumentUtil.h"
 #include "FBXProperties.h"
 
+#include <utility>
+
 namespace Assimp {
 namespace FBX {
 
@@ -172,10 +174,8 @@ PropertyTable::PropertyTable()
 }
 
 // ------------------------------------------------------------------------------------------------
-PropertyTable::PropertyTable(const Element& element, std::shared_ptr<const PropertyTable> templateProps)
-: templateProps(templateProps)
-, element(&element)
-{
+PropertyTable::PropertyTable(const Element &element, std::shared_ptr<const PropertyTable> templateProps) :
+        templateProps(std::move(templateProps)), element(&element) {
     const Scope& scope = GetRequiredScope(element);
     for(const ElementMap::value_type& v : scope.Elements()) {
         if(v.first != "P") {
@@ -199,7 +199,6 @@ PropertyTable::PropertyTable(const Element& element, std::shared_ptr<const Prope
     }
 }
 
-
 // ------------------------------------------------------------------------------------------------
 PropertyTable::~PropertyTable()
 {
diff --git a/code/AssetLib/IFC/IFCGeometry.cpp b/code/AssetLib/IFC/IFCGeometry.cpp
index 6e645f1ae..e70c760d8 100644
--- a/code/AssetLib/IFC/IFCGeometry.cpp
+++ b/code/AssetLib/IFC/IFCGeometry.cpp
@@ -740,7 +740,7 @@ bool ProcessGeometricItem(const Schema_2x3::IfcRepresentationItem& geo, unsigned
     bool fix_orientation = false;
     std::shared_ptr< TempMesh > meshtmp = std::make_shared<TempMesh>();
     if(const Schema_2x3::IfcShellBasedSurfaceModel* shellmod = geo.ToPtr<Schema_2x3::IfcShellBasedSurfaceModel>()) {
-        for(std::shared_ptr<const Schema_2x3::IfcShell> shell :shellmod->SbsmBoundary) {
+        for (const std::shared_ptr<const Schema_2x3::IfcShell> &shell : shellmod->SbsmBoundary) {
             try {
                 const ::Assimp::STEP::EXPRESS::ENTITY& e = shell->To<::Assimp::STEP::EXPRESS::ENTITY>();
                 const Schema_2x3::IfcConnectedFaceSet& fs = conv.db.MustGetObject(e).To<Schema_2x3::IfcConnectedFaceSet>();
diff --git a/code/AssetLib/IFC/IFCMaterial.cpp b/code/AssetLib/IFC/IFCMaterial.cpp
index 2a79f0754..c26a3aa0a 100644
--- a/code/AssetLib/IFC/IFCMaterial.cpp
+++ b/code/AssetLib/IFC/IFCMaterial.cpp
@@ -75,7 +75,7 @@ static void FillMaterial(aiMaterial* mat,const IFC::Schema_2x3::IfcSurfaceStyle*
     mat->AddProperty(&name,AI_MATKEY_NAME);
 
     // now see which kinds of surface information are present
-    for(std::shared_ptr< const IFC::Schema_2x3::IfcSurfaceStyleElementSelect > sel2 : surf->Styles) {
+    for (const std::shared_ptr<const IFC::Schema_2x3::IfcSurfaceStyleElementSelect> &sel2 : surf->Styles) {
         if (const IFC::Schema_2x3::IfcSurfaceStyleShading* shade = sel2->ResolveSelectPtr<IFC::Schema_2x3::IfcSurfaceStyleShading>(conv.db)) {
             aiColor4D col_base,col;
 
@@ -124,7 +124,7 @@ static void FillMaterial(aiMaterial* mat,const IFC::Schema_2x3::IfcSurfaceStyle*
                     }
                 }
             }
-        } 
+        }
     }
 }
 
@@ -134,7 +134,7 @@ unsigned int ProcessMaterials(uint64_t id, unsigned int prevMatId, ConversionDat
     for(;range.first != range.second; ++range.first) {
         if(const IFC::Schema_2x3::IfcStyledItem* const styled = conv.db.GetObject((*range.first).second)->ToPtr<IFC::Schema_2x3::IfcStyledItem>()) {
             for(const IFC::Schema_2x3::IfcPresentationStyleAssignment& as : styled->Styles) {
-                for(std::shared_ptr<const IFC::Schema_2x3::IfcPresentationStyleSelect> sel : as.Styles) {
+                for (const std::shared_ptr<const IFC::Schema_2x3::IfcPresentationStyleSelect> &sel : as.Styles) {
 
                     if( const IFC::Schema_2x3::IfcSurfaceStyle* const surf = sel->ResolveSelectPtr<IFC::Schema_2x3::IfcSurfaceStyle>(conv.db) ) {
                         // try to satisfy from cache
diff --git a/code/AssetLib/IFC/IFCUtil.h b/code/AssetLib/IFC/IFCUtil.h
index a1190746b..b18f35052 100644
--- a/code/AssetLib/IFC/IFCUtil.h
+++ b/code/AssetLib/IFC/IFCUtil.h
@@ -54,6 +54,8 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <assimp/mesh.h>
 #include <assimp/material.h>
 
+#include <utility>
+
 struct aiNode;
 
 namespace Assimp {
@@ -137,14 +139,10 @@ struct TempOpening
     }
 
     // ------------------------------------------------------------------------------
-    TempOpening(const IFC::Schema_2x3::IfcSolidModel* solid,IfcVector3 extrusionDir,
-        std::shared_ptr<TempMesh> profileMesh,
-        std::shared_ptr<TempMesh> profileMesh2D)
-        : solid(solid)
-        , extrusionDir(extrusionDir)
-        , profileMesh(profileMesh)
-        , profileMesh2D(profileMesh2D)
-    {
+    TempOpening(const IFC::Schema_2x3::IfcSolidModel *solid, IfcVector3 extrusionDir,
+            std::shared_ptr<TempMesh> profileMesh,
+            std::shared_ptr<TempMesh> profileMesh2D) :
+            solid(solid), extrusionDir(extrusionDir), profileMesh(std::move(profileMesh)), profileMesh2D(std::move(profileMesh2D)) {
     }
 
     // ------------------------------------------------------------------------------
diff --git a/code/AssetLib/LWS/LWSLoader.cpp b/code/AssetLib/LWS/LWSLoader.cpp
index d469a1064..01a50b6e4 100644
--- a/code/AssetLib/LWS/LWSLoader.cpp
+++ b/code/AssetLib/LWS/LWSLoader.cpp
@@ -318,7 +318,7 @@ void LWSImporter::SetupNodeName(aiNode *nd, LWS::NodeDesc &src) {
             } else {
                 ++s;
             }
-            std::string::size_type t = src.path.substr(s).find_last_of(".");
+            std::string::size_type t = src.path.substr(s).find_last_of('.');
 
             nd->mName.length = ::ai_snprintf(nd->mName.data, MAXLEN, "%s_(%08X)", src.path.substr(s).substr(0, t).c_str(), combined);
             return;
diff --git a/code/AssetLib/M3D/M3DImporter.cpp b/code/AssetLib/M3D/M3DImporter.cpp
index 38bbd1d4a..4b2f9bd77 100644
--- a/code/AssetLib/M3D/M3DImporter.cpp
+++ b/code/AssetLib/M3D/M3DImporter.cpp
@@ -655,7 +655,7 @@ void M3DImporter::convertPose(const M3DWrapper &m3d, aiMatrix4x4 *m, unsigned in
 
 // ------------------------------------------------------------------------------------------------
 // find a node by name
-aiNode *M3DImporter::findNode(aiNode *pNode, aiString name) {
+aiNode *M3DImporter::findNode(aiNode *pNode, const aiString &name) {
     ai_assert(pNode != nullptr);
     ai_assert(mScene != nullptr);
 
diff --git a/code/AssetLib/M3D/M3DImporter.h b/code/AssetLib/M3D/M3DImporter.h
index 7a2a9fbd3..05e8ced7b 100644
--- a/code/AssetLib/M3D/M3DImporter.h
+++ b/code/AssetLib/M3D/M3DImporter.h
@@ -89,8 +89,8 @@ private:
 	// helper functions
 	aiColor4D mkColor(uint32_t c);
 	void convertPose(const M3DWrapper &m3d, aiMatrix4x4 *m, unsigned int posid, unsigned int orientid);
-	aiNode *findNode(aiNode *pNode, aiString name);
-	void calculateOffsetMatrix(aiNode *pNode, aiMatrix4x4 *m);
+    aiNode *findNode(aiNode *pNode, const aiString &name);
+    void calculateOffsetMatrix(aiNode *pNode, aiMatrix4x4 *m);
 	void populateMesh(const M3DWrapper &m3d, aiMesh *pMesh, std::vector<aiFace> *faces, std::vector<aiVector3D> *verteces,
 			std::vector<aiVector3D> *normals, std::vector<aiVector3D> *texcoords, std::vector<aiColor4D> *colors,
 			std::vector<unsigned int> *vertexids);
diff --git a/code/AssetLib/Ogre/OgreMaterial.cpp b/code/AssetLib/Ogre/OgreMaterial.cpp
index 295dedde6..6da82f89c 100644
--- a/code/AssetLib/Ogre/OgreMaterial.cpp
+++ b/code/AssetLib/Ogre/OgreMaterial.cpp
@@ -415,8 +415,8 @@ bool OgreImporter::ReadTextureUnit(const std::string &textureUnitName, stringstr
 
             // User defined Assimp config property to detect texture type from filename.
             if (m_detectTextureTypeFromFilename) {
-                size_t posSuffix = textureRef.find_last_of(".");
-                size_t posUnderscore = textureRef.find_last_of("_");
+                size_t posSuffix = textureRef.find_last_of('.');
+                size_t posUnderscore = textureRef.find_last_of('_');
 
                 if (posSuffix != string::npos && posUnderscore != string::npos && posSuffix > posUnderscore) {
                     string identifier = ai_tolower(textureRef.substr(posUnderscore, posSuffix - posUnderscore));
diff --git a/code/AssetLib/Q3BSP/Q3BSPFileImporter.cpp b/code/AssetLib/Q3BSP/Q3BSPFileImporter.cpp
index becfa41fc..a1da8fd74 100644
--- a/code/AssetLib/Q3BSP/Q3BSPFileImporter.cpp
+++ b/code/AssetLib/Q3BSP/Q3BSPFileImporter.cpp
@@ -99,7 +99,7 @@ static void extractIds(const std::string &key, int &id1, int &id2) {
         return;
     }
 
-    const std::string::size_type pos = key.find(".");
+    const std::string::size_type pos = key.find('.');
     if (std::string::npos == pos) {
         return;
     }
@@ -208,7 +208,7 @@ void Q3BSPFileImporter::separateMapName(const std::string &importName, std::stri
         return;
     }
 
-    const std::string::size_type pos = importName.rfind(",");
+    const std::string::size_type pos = importName.rfind(',');
     if (std::string::npos == pos) {
         archiveName = importName;
         return;
diff --git a/code/AssetLib/STEPParser/STEPFileReader.cpp b/code/AssetLib/STEPParser/STEPFileReader.cpp
index e97ea1e28..ac6d83672 100644
--- a/code/AssetLib/STEPParser/STEPFileReader.cpp
+++ b/code/AssetLib/STEPParser/STEPFileReader.cpp
@@ -49,8 +49,9 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "STEPFileEncoding.h"
 #include <assimp/TinyFormatter.h>
 #include <assimp/fast_atof.h>
-#include <memory>
 #include <functional>
+#include <memory>
+#include <utility>
 
 using namespace Assimp;
 
@@ -87,7 +88,7 @@ static const char *ISO_Token         = "ISO-10303-21;";
 static const char *FILE_SCHEMA_Token = "FILE_SCHEMA";
 // ------------------------------------------------------------------------------------------------
 STEP::DB* STEP::ReadFileHeader(std::shared_ptr<IOStream> stream) {
-    std::shared_ptr<StreamReaderLE> reader = std::shared_ptr<StreamReaderLE>(new StreamReaderLE(stream));
+    std::shared_ptr<StreamReaderLE> reader = std::shared_ptr<StreamReaderLE>(new StreamReaderLE(std::move(stream)));
     std::unique_ptr<STEP::DB> db = std::unique_ptr<STEP::DB>(new STEP::DB(reader));
 
     LineSplitter &splitter = db->GetSplitter();
diff --git a/code/AssetLib/Step/STEPFile.h b/code/AssetLib/Step/STEPFile.h
index 90eaef5f3..e09faad98 100644
--- a/code/AssetLib/Step/STEPFile.h
+++ b/code/AssetLib/Step/STEPFile.h
@@ -634,7 +634,7 @@ private:
 };
 
 template <typename T>
-inline bool operator==(std::shared_ptr<LazyObject> lo, T whatever) {
+inline bool operator==(const std::shared_ptr<LazyObject> &lo, T whatever) {
     return *lo == whatever; // XXX use std::forward if we have 0x
 }
 
@@ -816,7 +816,7 @@ public:
     typedef std::pair<RefMap::const_iterator, RefMap::const_iterator> RefMapRange;
 
 private:
-    DB(std::shared_ptr<StreamReaderLE> reader) :
+    DB(const std::shared_ptr<StreamReaderLE> &reader) :
             reader(reader), splitter(*reader, true, true), evaluated_count(), schema(nullptr) {}
 
 public:
diff --git a/code/AssetLib/X/XFileExporter.cpp b/code/AssetLib/X/XFileExporter.cpp
index da20b935a..bd997a3c5 100644
--- a/code/AssetLib/X/XFileExporter.cpp
+++ b/code/AssetLib/X/XFileExporter.cpp
@@ -530,8 +530,8 @@ void XFileExporter::writePath(const aiString &path)
     while( str.find( "\\\\") != std::string::npos)
         str.replace( str.find( "\\\\"), 2, "\\");
 
-    while( str.find( "\\") != std::string::npos)
-        str.replace( str.find( "\\"), 1, "/");
+    while (str.find('\\') != std::string::npos)
+        str.replace(str.find('\\'), 1, "/");
 
     mOutput << str;
 
diff --git a/code/AssetLib/X3D/X3DExporter.hpp b/code/AssetLib/X3D/X3DExporter.hpp
index 00115e0b6..fefaba9f3 100644
--- a/code/AssetLib/X3D/X3DExporter.hpp
+++ b/code/AssetLib/X3D/X3DExporter.hpp
@@ -63,9 +63,9 @@ class X3DExporter {
             // empty
         }
 
-        SAttribute(SAttribute && rhs) :
-                Name(std::move(rhs.Name)),
-                Value(std::move(rhs.Value)) {
+        SAttribute(SAttribute &&rhs) AI_NO_EXCEPT :
+                Name(rhs.Name),
+                Value(rhs.Value) {
             // empty
         }
     };
diff --git a/code/AssetLib/glTF/glTFAsset.h b/code/AssetLib/glTF/glTFAsset.h
index da49a1737..4cef646d2 100644
--- a/code/AssetLib/glTF/glTFAsset.h
+++ b/code/AssetLib/glTF/glTFAsset.h
@@ -456,11 +456,10 @@ namespace glTF
 			/// \param [in] pDecodedData - pointer to decoded data array.
 			/// \param [in] pDecodedData_Length - size of encoded region, in bytes.
 			/// \param [in] pID - ID of the region.
-			SEncodedRegion(const size_t pOffset, const size_t pEncodedData_Length, uint8_t* pDecodedData, const size_t pDecodedData_Length, const std::string pID)
-				: Offset(pOffset), EncodedData_Length(pEncodedData_Length), DecodedData(pDecodedData), DecodedData_Length(pDecodedData_Length), ID(pID)
-			{}
+            SEncodedRegion(const size_t pOffset, const size_t pEncodedData_Length, uint8_t *pDecodedData, const size_t pDecodedData_Length, const std::string &pID) :
+                    Offset(pOffset), EncodedData_Length(pEncodedData_Length), DecodedData(pDecodedData), DecodedData_Length(pDecodedData_Length), ID(pID) {}
 
-			/// \fn ~SEncodedRegion()
+            /// \fn ~SEncodedRegion()
 			/// Destructor.
 			~SEncodedRegion() { delete [] DecodedData; }
 		};
@@ -1149,8 +1148,7 @@ namespace glTF
 
         void ReadExtensionsUsed(Document& doc);
 
-
-        IOStream* OpenFile(std::string path, const char* mode, bool absolute = false);
+        IOStream *OpenFile(const std::string &path, const char *mode, bool absolute = false);
     };
 
 }
diff --git a/code/AssetLib/glTF/glTFAsset.inl b/code/AssetLib/glTF/glTFAsset.inl
index 6e1e60846..e915a3aee 100644
--- a/code/AssetLib/glTF/glTFAsset.inl
+++ b/code/AssetLib/glTF/glTFAsset.inl
@@ -1377,7 +1377,7 @@ inline void Asset::ReadExtensionsUsed(Document &doc) {
 #undef CHECK_EXT
 }
 
-inline IOStream *Asset::OpenFile(std::string path, const char *mode, bool absolute) {
+inline IOStream *Asset::OpenFile(const std::string& path, const char *mode, bool absolute) {
 #ifdef ASSIMP_API
     (void)absolute;
     return mIOSystem->Open(path, mode);
diff --git a/code/AssetLib/glTF/glTFExporter.cpp b/code/AssetLib/glTF/glTFExporter.cpp
index 5e1992319..810263f52 100644
--- a/code/AssetLib/glTF/glTFExporter.cpp
+++ b/code/AssetLib/glTF/glTFExporter.cpp
@@ -405,8 +405,7 @@ void glTFExporter::ExportMaterials()
  * Search through node hierarchy and find the node containing the given meshID.
  * Returns true on success, and false otherwise.
  */
-bool FindMeshNode(Ref<Node>& nodeIn, Ref<Node>& meshNode, std::string meshID)
-{
+bool FindMeshNode(Ref<Node> &nodeIn, Ref<Node> &meshNode, const std::string &meshID) {
     for (unsigned int i = 0; i < nodeIn->meshes.size(); ++i) {
         if (meshID.compare(nodeIn->meshes[i]->id) == 0) {
           meshNode = nodeIn;
diff --git a/code/AssetLib/glTF2/glTF2Asset.h b/code/AssetLib/glTF2/glTF2Asset.h
index 605cda332..d1d203849 100644
--- a/code/AssetLib/glTF2/glTF2Asset.h
+++ b/code/AssetLib/glTF2/glTF2Asset.h
@@ -459,7 +459,7 @@ public:
         /// \param [in] pDecodedData - pointer to decoded data array.
         /// \param [in] pDecodedData_Length - size of encoded region, in bytes.
         /// \param [in] pID - ID of the region.
-        SEncodedRegion(const size_t pOffset, const size_t pEncodedData_Length, uint8_t *pDecodedData, const size_t pDecodedData_Length, const std::string pID) :
+        SEncodedRegion(const size_t pOffset, const size_t pEncodedData_Length, uint8_t *pDecodedData, const size_t pDecodedData_Length, const std::string &pID) :
                 Offset(pOffset),
                 EncodedData_Length(pEncodedData_Length),
                 DecodedData(pDecodedData),
@@ -1193,7 +1193,7 @@ private:
     void ReadExtensionsUsed(Document &doc);
     void ReadExtensionsRequired(Document &doc);
 
-    IOStream *OpenFile(std::string path, const char *mode, bool absolute = false);
+    IOStream *OpenFile(const std::string &path, const char *mode, bool absolute = false);
 };
 
 inline std::string getContextForErrorMessages(const std::string &id, const std::string &name) {
diff --git a/code/AssetLib/glTF2/glTF2Asset.inl b/code/AssetLib/glTF2/glTF2Asset.inl
index 4bcfea5f7..701d876c6 100644
--- a/code/AssetLib/glTF2/glTF2Asset.inl
+++ b/code/AssetLib/glTF2/glTF2Asset.inl
@@ -2143,7 +2143,7 @@ inline void Asset::ReadExtensionsUsed(Document &doc) {
 #undef CHECK_EXT
 }
 
-inline IOStream *Asset::OpenFile(std::string path, const char *mode, bool /*absolute*/) {
+inline IOStream *Asset::OpenFile(const std::string& path, const char *mode, bool /*absolute*/) {
 #ifdef ASSIMP_API
     return mIOSystem->Open(path, mode);
 #else
diff --git a/code/AssetLib/glTF2/glTF2Exporter.cpp b/code/AssetLib/glTF2/glTF2Exporter.cpp
index 3ed27a035..78e22e931 100644
--- a/code/AssetLib/glTF2/glTF2Exporter.cpp
+++ b/code/AssetLib/glTF2/glTF2Exporter.cpp
@@ -839,8 +839,7 @@ void glTF2Exporter::ExportMaterials()
  * Search through node hierarchy and find the node containing the given meshID.
  * Returns true on success, and false otherwise.
  */
-bool FindMeshNode(Ref<Node>& nodeIn, Ref<Node>& meshNode, std::string meshID)
-{
+bool FindMeshNode(Ref<Node> &nodeIn, Ref<Node> &meshNode, const std::string &meshID) {
     for (unsigned int i = 0; i < nodeIn->meshes.size(); ++i) {
         if (meshID.compare(nodeIn->meshes[i]->id) == 0) {
             meshNode = nodeIn;
diff --git a/code/Pbrt/PbrtExporter.cpp b/code/Pbrt/PbrtExporter.cpp
index b793c37f9..0be244600 100644
--- a/code/Pbrt/PbrtExporter.cpp
+++ b/code/Pbrt/PbrtExporter.cpp
@@ -106,14 +106,13 @@ void ExportScenePbrt (
 } // end of namespace Assimp
 
 // Constructor
-PbrtExporter::PbrtExporter (
-    const aiScene* pScene, IOSystem* pIOSystem,
-    const std::string path, const std::string file)
-: mScene(pScene),
-  mIOSystem(pIOSystem),
-  mPath(path),
-  mFile(file)
-{
+PbrtExporter::PbrtExporter(
+        const aiScene *pScene, IOSystem *pIOSystem,
+        const std::string &path, const std::string &file) :
+        mScene(pScene),
+        mIOSystem(pIOSystem),
+        mPath(path),
+        mFile(file) {
     // Export embedded textures.
     if (mScene->mNumTextures > 0)
         if (!mIOSystem->CreateDirectory("textures"))
@@ -210,12 +209,12 @@ void PbrtExporter::WriteMetaData() {
                 aiString* value =
                     static_cast<aiString*>(pMetaData->mValues[i].mData);
                 std::string svalue = value->C_Str();
-                std::size_t found = svalue.find_first_of("\n");
+                std::size_t found = svalue.find_first_of('\n');
                 mOutput << "\n";
                 while (found != std::string::npos) {
                     mOutput << "#     " << svalue.substr(0, found) << "\n";
                     svalue = svalue.substr(found + 1);
-                    found = svalue.find_first_of("\n");
+                    found = svalue.find_first_of('\n');
                 }
                 mOutput << "#     " << svalue << "\n";
                 break;
@@ -596,8 +595,8 @@ void PbrtExporter::WriteMaterial(int m) {
     }
     mOutput << "\n";
 
-    auto White = [](aiColor3D c) { return c.r == 1 && c.g == 1 && c.b == 1; };
-    auto Black = [](aiColor3D c) { return c.r == 0 && c.g == 0 && c.b == 0; };
+    auto White = [](const aiColor3D &c) { return c.r == 1 && c.g == 1 && c.b == 1; };
+    auto Black = [](const aiColor3D &c) { return c.r == 0 && c.g == 0 && c.b == 0; };
 
     aiColor3D diffuse, specular, transparency;
     bool constantDiffuse = (material->Get(AI_MATKEY_COLOR_DIFFUSE, diffuse) == AI_SUCCESS &&
diff --git a/code/Pbrt/PbrtExporter.h b/code/Pbrt/PbrtExporter.h
index 167f318fc..e8ff03ccb 100644
--- a/code/Pbrt/PbrtExporter.h
+++ b/code/Pbrt/PbrtExporter.h
@@ -74,8 +74,8 @@ class PbrtExporter
 {
 public:
     /// Constructor for a specific scene to export
-    PbrtExporter(const aiScene* pScene, IOSystem* pIOSystem,
-        const std::string path, const std::string file);
+    PbrtExporter(const aiScene *pScene, IOSystem *pIOSystem,
+            const std::string &path, const std::string &file);
 
     /// Destructor
     virtual ~PbrtExporter();
diff --git a/code/PostProcessing/EmbedTexturesProcess.cpp b/code/PostProcessing/EmbedTexturesProcess.cpp
index cb2853926..500032c39 100644
--- a/code/PostProcessing/EmbedTexturesProcess.cpp
+++ b/code/PostProcessing/EmbedTexturesProcess.cpp
@@ -100,7 +100,7 @@ void EmbedTexturesProcess::Execute(aiScene* pScene) {
     ASSIMP_LOG_INFO("EmbedTexturesProcess finished. Embedded ", embeddedTexturesCount, " textures." );
 }
 
-bool EmbedTexturesProcess::addTexture(aiScene* pScene, std::string path) const {
+bool EmbedTexturesProcess::addTexture(aiScene *pScene, const std::string &path) const {
     std::streampos imageSize = 0;
     std::string    imagePath = path;
 
diff --git a/code/PostProcessing/EmbedTexturesProcess.h b/code/PostProcessing/EmbedTexturesProcess.h
index 5915e0d44..b33968850 100644
--- a/code/PostProcessing/EmbedTexturesProcess.h
+++ b/code/PostProcessing/EmbedTexturesProcess.h
@@ -78,7 +78,7 @@ public:
 
 private:
     // Resolve the path and add the file content to the scene as a texture.
-    bool addTexture(aiScene* pScene, std::string path) const;
+    bool addTexture(aiScene *pScene, const std::string &path) const;
 
 private:
     std::string mRootPath;
diff --git a/test/unit/utTypes.cpp b/test/unit/utTypes.cpp
index cc354eb3d..1ac9a1d5e 100644
--- a/test/unit/utTypes.cpp
+++ b/test/unit/utTypes.cpp
@@ -53,8 +53,8 @@ class utTypes : public ::testing::Test {
 TEST_F( utTypes, Color3dCpmpareOpTest ) {
     aiColor3D col1( 1, 2, 3 );
     aiColor3D col2( 4, 5, 6 );
-    aiColor3D col3( col1 );
-    
+    const aiColor3D &col3(col1);
+
     EXPECT_FALSE( col1 == col2 );
     EXPECT_FALSE( col2 == col3 );
     EXPECT_TRUE( col1 == col3 );