42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
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#if (!defined AI_QNAN_H_INCLUDED)
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#define AI_QNAN_H_INCLUDED
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#if (!defined ASSIMP_BUILD_CPP_09)
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# include <boost/static_assert.hpp>
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#endif
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inline bool is_qnan(const float in)
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{
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// _isnan() takes a double as argument and would
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// require a cast. Therefore we must do it on our own ...
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// Another method would be to check whether in != in.
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// This should also wor since nan compares to inequal,
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// even when compared with itself. However, this could
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// case problems with other special floats like snan or inf
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union _tagFPUNION
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{
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float f;
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int32_t i;
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} FPUNION1,FPUNION2;
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// use a compile-time asertion if possible
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#if (defined ASSIMP_BUILD_CPP_09)
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static_assert(sizeof(float)==sizeof(int32_t),
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"A float seems not to be 4 bytes on this platform");
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#else
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BOOST_STATIC_ASSERT(sizeof(float)==sizeof(int32_t));
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#endif
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FPUNION1.f = in;
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FPUNION2.f = std::numeric_limits<float>::quiet_NaN();
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return FPUNION1.i == FPUNION2.i;
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}
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inline bool is_not_qnan(const float in)
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{
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return !is_qnan(in);
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}
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#endif // !! AI_QNAN_H_INCLUDED
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