minor code improvements for the obj code

- make use of range for loops
- make use of empty() method for the std::vector
- removed unnecessary std::string initialization
- use ' ' instead of " " for the find methods (should be "faster")
- simplified some function
- make use of emplace_back instead of push_back (should be "faster")
- other small changes

code/Obj/ObjFileImporter.cpp

@@ -175,15 +175,15 @@ void ObjFileImporter::CreateDataFromImport(const ObjFile::Model* pModel, aiScene
         ai_assert(false);
     }
 
-    if (pModel->m_Objects.size() > 0) {
+    if (!pModel->m_Objects.empty()) {
 
         unsigned int meshCount = 0;
         unsigned int childCount = 0;
 
-        for(size_t index = 0; index < pModel->m_Objects.size(); ++index) {
+        for (auto object : pModel->m_Objects) {
-            if(pModel->m_Objects[index]) {
+            if(object) {
                 ++childCount;
-                meshCount += (unsigned int)pModel->m_Objects[index]->m_Meshes.size();
+                meshCount += (unsigned int)object->m_Meshes.size();
             }
         }
 
@@ -365,8 +365,8 @@ aiMesh *ObjFileImporter::createTopology( const ObjFile::Model* pModel, const Obj
         unsigned int outIndex( 0 );
 
         // Copy all data from all stored meshes
-        for (size_t index = 0; index < pObjMesh->m_Faces.size(); index++) {
+        for (auto& face : pObjMesh->m_Faces) {
-            ObjFile::Face* const inp = pObjMesh->m_Faces[ index ];
+            ObjFile::Face* const inp = face;
             if (inp->m_PrimitiveType == aiPrimitiveType_LINE) {
                 for(size_t i = 0; i < inp->m_vertices.size() - 1; ++i) {
                     aiFace& f = pMesh->mFaces[ outIndex++ ];
@@ -385,7 +385,7 @@ aiMesh *ObjFileImporter::createTopology( const ObjFile::Model* pModel, const Obj
             }
 
             aiFace *pFace = &pMesh->mFaces[ outIndex++ ];
-            const unsigned int uiNumIndices = (unsigned int) pObjMesh->m_Faces[ index ]->m_vertices.size();
+            const unsigned int uiNumIndices = (unsigned int) face->m_vertices.size();
             uiIdxCount += pFace->mNumIndices = (unsigned int) uiNumIndices;
             if (pFace->mNumIndices > 0) {
                 pFace->mIndices = new unsigned int[ uiNumIndices ];
@@ -446,13 +446,10 @@ void ObjFileImporter::createVertexArray(const ObjFile::Model* pModel,
     // Copy vertices, normals and textures into aiMesh instance
     bool normalsok = true, uvok = true;
     unsigned int newIndex = 0, outIndex = 0;
-    for ( size_t index=0; index < pObjMesh->m_Faces.size(); index++ ) {
+    for (auto sourceFace : pObjMesh->m_Faces) {
-        // Get source face
-        ObjFile::Face *pSourceFace = pObjMesh->m_Faces[ index ];
-
         // Copy all index arrays
-        for ( size_t vertexIndex = 0, outVertexIndex = 0; vertexIndex < pSourceFace->m_vertices.size(); vertexIndex++ ) {
+        for (size_t vertexIndex = 0, outVertexIndex = 0; vertexIndex < sourceFace->m_vertices.size(); vertexIndex++ ) {
-            const unsigned int vertex = pSourceFace->m_vertices.at( vertexIndex );
+            const unsigned int vertex = sourceFace->m_vertices.at(vertexIndex );
             if ( vertex >= pModel->m_Vertices.size() ) {
                 throw DeadlyImportError( "OBJ: vertex index out of range" );
             }
@@ -464,8 +461,8 @@ void ObjFileImporter::createVertexArray(const ObjFile::Model* pModel,
             pMesh->mVertices[ newIndex ] = pModel->m_Vertices[ vertex ];
 
             // Copy all normals
-            if ( normalsok && !pModel->m_Normals.empty() && vertexIndex < pSourceFace->m_normals.size()) {
+            if ( normalsok && !pModel->m_Normals.empty() && vertexIndex < sourceFace->m_normals.size()) {
-                const unsigned int normal = pSourceFace->m_normals.at( vertexIndex );
+                const unsigned int normal = sourceFace->m_normals.at(vertexIndex );
                 if ( normal >= pModel->m_Normals.size() )
                 {
                     normalsok = false;
@@ -484,9 +481,9 @@ void ObjFileImporter::createVertexArray(const ObjFile::Model* pModel,
             }
 
             // Copy all texture coordinates
-            if ( uvok && !pModel->m_TextureCoord.empty() && vertexIndex < pSourceFace->m_texturCoords.size())
+            if ( uvok && !pModel->m_TextureCoord.empty() && vertexIndex < sourceFace->m_texturCoords.size())
             {
-                const unsigned int tex = pSourceFace->m_texturCoords.at( vertexIndex );
+                const unsigned int tex = sourceFace->m_texturCoords.at(vertexIndex );
 
                 if ( tex >= pModel->m_TextureCoord.size() )
                 {
@@ -502,16 +499,16 @@ void ObjFileImporter::createVertexArray(const ObjFile::Model* pModel,
             // Get destination face
             aiFace *pDestFace = &pMesh->mFaces[ outIndex ];
 
-            const bool last = ( vertexIndex == pSourceFace->m_vertices.size() - 1 );
+            const bool last = (vertexIndex == sourceFace->m_vertices.size() - 1 );
-            if (pSourceFace->m_PrimitiveType != aiPrimitiveType_LINE || !last) {
+            if (sourceFace->m_PrimitiveType != aiPrimitiveType_LINE || !last) {
                 pDestFace->mIndices[ outVertexIndex ] = newIndex;
                 outVertexIndex++;
             }
 
-            if (pSourceFace->m_PrimitiveType == aiPrimitiveType_POINT) {
+            if (sourceFace->m_PrimitiveType == aiPrimitiveType_POINT) {
                 outIndex++;
                 outVertexIndex = 0;
-            } else if (pSourceFace->m_PrimitiveType == aiPrimitiveType_LINE) {
+            } else if (sourceFace->m_PrimitiveType == aiPrimitiveType_LINE) {
                 outVertexIndex = 0;
 
                 if(!last)
@@ -520,7 +517,7 @@ void ObjFileImporter::createVertexArray(const ObjFile::Model* pModel,
                 if (vertexIndex) {
                     if(!last) {
                         pMesh->mVertices[ newIndex+1 ] = pMesh->mVertices[ newIndex ];
-                        if ( !pSourceFace->m_normals.empty() && !pModel->m_Normals.empty()) {
+                        if (!sourceFace->m_normals.empty() && !pModel->m_Normals.empty()) {
                             pMesh->mNormals[ newIndex+1 ] = pMesh->mNormals[newIndex ];
                         }
                         if ( !pModel->m_TextureCoord.empty() ) {
@@ -563,13 +560,11 @@ void ObjFileImporter::countObjects(const std::vector<ObjFile::Object*> &rObjects
         return;
 
     iNumMeshes += static_cast<unsigned int>( rObjects.size() );
-    for (std::vector<ObjFile::Object*>::const_iterator it = rObjects.begin();
+    for (auto object: rObjects)
-        it != rObjects.end();
-        ++it)
     {
-        if (!(*it)->m_SubObjects.empty())
+        if (!object->m_SubObjects.empty())
         {
-            countObjects((*it)->m_SubObjects, iNumMeshes);
+            countObjects(object->m_SubObjects, iNumMeshes);
         }
     }
 }

code/Obj/ObjFileMtlImporter.cpp

@@ -274,7 +274,7 @@ void ObjFileMtlImporter::getFloatValue( ai_real &value )
 //  Creates a material from loaded data.
 void ObjFileMtlImporter::createMaterial()
 {
-    std::string line( "" );
+    std::string line;
     while( !IsLineEnd( *m_DataIt ) ) {
         line += *m_DataIt;
         ++m_DataIt;
@@ -282,7 +282,7 @@ void ObjFileMtlImporter::createMaterial()
 
     std::vector<std::string> token;
     const unsigned int numToken = tokenize<std::string>( line, token, " \t" );
-    std::string name( "" );
+    std::string name;
     if ( numToken == 1 ) {
         name = AI_DEFAULT_MATERIAL_NAME;
     } else {

code/Obj/ObjFileParser.cpp

@@ -96,9 +96,6 @@ ObjFileParser::ObjFileParser( IOStreamBuffer<char> &streamBuffer, const std::str
     parseFile( streamBuffer );
 }
 
-ObjFileParser::~ObjFileParser() {
-}
-
 void ObjFileParser::setBuffer( std::vector<char> &buffer ) {
     m_DataIt = buffer.begin();
     m_DataItEnd = buffer.end();
@@ -182,7 +179,7 @@ void ObjFileParser::parseFile( IOStreamBuffer<char> &streamBuffer ) {
 
                 getNameNoSpace(m_DataIt, m_DataItEnd, name);
 
-                size_t nextSpace = name.find(" ");
+                size_t nextSpace = name.find(' ');
                 if (nextSpace != std::string::npos)
                     name = name.substr(0, nextSpace);
 
@@ -199,7 +196,7 @@ void ObjFileParser::parseFile( IOStreamBuffer<char> &streamBuffer ) {
 
                 getNameNoSpace(m_DataIt, m_DataItEnd, name);
 
-                size_t nextSpace = name.find(" ");
+                size_t nextSpace = name.find(' ');
                 if (nextSpace != std::string::npos)
                     name = name.substr(0, nextSpace);
 
@@ -274,13 +271,8 @@ static bool isDataDefinitionEnd( const char *tmp ) {
 
 static bool isNanOrInf(const char * in) {
     // Look for "nan" or "inf", case insensitive
-    if ((in[0] == 'N' || in[0] == 'n') && ASSIMP_strincmp(in, "nan", 3) == 0) {
+	return ((in[0] == 'N' || in[0] == 'n') && ASSIMP_strincmp(in, "nan", 3) == 0) ||
-        return true;
+	       ((in[0] == 'I' || in[0] == 'i') && ASSIMP_strincmp(in, "inf", 3) == 0);
-    }
-    else if ((in[0] == 'I' || in[0] == 'i') && ASSIMP_strincmp(in, "inf", 3) == 0) {
-        return true;
-    }
-    return false;
 }
 
 size_t ObjFileParser::getNumComponentsInDataDefinition() {
@@ -341,7 +333,7 @@ size_t ObjFileParser::getTexCoordVector( std::vector<aiVector3D> &point3d_array
     if (!std::isfinite(z))
         z = 0;
 
-    point3d_array.push_back( aiVector3D( x, y, z ) );
+    point3d_array.emplace_back( x, y, z );
     m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
     return numComponents;
 }
@@ -357,7 +349,7 @@ void ObjFileParser::getVector3( std::vector<aiVector3D> &point3d_array ) {
     copyNextWord( m_buffer, Buffersize );
     z = ( ai_real ) fast_atof( m_buffer );
 
-    point3d_array.push_back( aiVector3D( x, y, z ) );
+    point3d_array.emplace_back( x, y, z );
     m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
 }
 
@@ -378,7 +370,7 @@ void ObjFileParser::getHomogeneousVector3( std::vector<aiVector3D> &point3d_arra
     if (w == 0)
       throw DeadlyImportError("OBJ: Invalid component in homogeneous vector (Division by zero)");
 
-    point3d_array.push_back( aiVector3D( x/w, y/w, z/w ) );
+    point3d_array.emplace_back( x/w, y/w, z/w );
     m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
 }
 
@@ -393,7 +385,7 @@ void ObjFileParser::getTwoVectors3( std::vector<aiVector3D> &point3d_array_a, st
     copyNextWord( m_buffer, Buffersize );
     z = ( ai_real ) fast_atof( m_buffer );
 
-    point3d_array_a.push_back( aiVector3D( x, y, z ) );
+    point3d_array_a.emplace_back( x, y, z );
 
     copyNextWord(m_buffer, Buffersize);
     x = (ai_real) fast_atof(m_buffer);
@@ -404,7 +396,7 @@ void ObjFileParser::getTwoVectors3( std::vector<aiVector3D> &point3d_array_a, st
     copyNextWord( m_buffer, Buffersize );
     z = ( ai_real ) fast_atof( m_buffer );
 
-    point3d_array_b.push_back( aiVector3D( x, y, z ) );
+    point3d_array_b.emplace_back( x, y, z );
 
     m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
 }
@@ -417,7 +409,7 @@ void ObjFileParser::getVector2( std::vector<aiVector2D> &point2d_array ) {
     copyNextWord(m_buffer, Buffersize);
     y = (ai_real) fast_atof(m_buffer);
 
-    point2d_array.push_back(aiVector2D(x, y));
+    point2d_array.emplace_back(x, y);
 
     m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
 }
@@ -439,7 +431,7 @@ void ObjFileParser::getFace( aiPrimitiveType type ) {
 
     const bool vt = (!m_pModel->m_TextureCoord.empty());
     const bool vn = (!m_pModel->m_Normals.empty());
-    int iStep = 0, iPos = 0;
+    int iStep, iPos = 0;
     while ( m_DataIt != m_DataItEnd ) {
         iStep = 1;
 
@@ -845,18 +837,18 @@ void ObjFileParser::createMesh( const std::string &meshName )
 bool ObjFileParser::needsNewMesh( const std::string &materialName )
 {
     // If no mesh data yet
-    if(m_pModel->m_pCurrentMesh == 0)
+    if (m_pModel->m_pCurrentMesh == nullptr)
     {
         return true;
     }
     bool newMat = false;
     int matIdx = getMaterialIndex( materialName );
-    int curMatIdx = m_pModel->m_pCurrentMesh->m_uiMaterialIndex;
+    unsigned int curMatIdx = m_pModel->m_pCurrentMesh->m_uiMaterialIndex;
     if ( curMatIdx != int(ObjFile::Mesh::NoMaterial)
         && curMatIdx != matIdx
         // no need create a new mesh if no faces in current
         // lets say 'usemtl' goes straight after 'g'
-        && m_pModel->m_pCurrentMesh->m_Faces.size() > 0 )
+        && !m_pModel->m_pCurrentMesh->m_Faces.empty() )
     {
         // New material -> only one material per mesh, so we need to create a new
         // material

code/Obj/ObjFileParser.h

@@ -80,7 +80,7 @@ public:
     /// @brief  Constructor with data array.
     ObjFileParser( IOStreamBuffer<char> &streamBuffer, const std::string &modelName, IOSystem* io, ProgressHandler* progress, const std::string &originalObjFileName);
     /// @brief  Destructor
-    ~ObjFileParser();
+    ~ObjFileParser() = default;
     /// @brief  If you want to load in-core data.
     void setBuffer( std::vector<char> &buffer );
     /// @brief  Model getter.