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62 lines
1.3 KiB
C++
62 lines
1.3 KiB
C++
#ifndef INCLUDED_UTIL_BITCAST_H
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#define INCLUDED_UTIL_BITCAST_H
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#include <stdexcept>
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#include <cstring>
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namespace Util
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{
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#if __cplusplus >= 202002L
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#include <bit>
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#define FloatAsInt(x) std::bit_cast<int>(x)
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#define IntAsFloat(x) std::bit_cast<float>(x)
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#define UintAsFloat(x) std::bit_cast<float>(x)
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#elif 1
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template <class Dest, class Source>
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inline Dest bit_cast(Source const& source) {
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static_assert(sizeof(Dest) == sizeof(Source), "size of destination and source objects must be equal");
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static_assert(std::is_trivially_copyable<Dest>::value, "destination type must be trivially copyable.");
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static_assert(std::is_trivially_copyable<Source>::value, "source type must be trivially copyable");
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Dest dest;
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std::memcpy(&dest, &source, sizeof(dest));
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return dest;
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}
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#define FloatAsInt(x) bit_cast<int,float>(x)
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#define IntAsFloat(x) bit_cast<float,int>(x)
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#define UintAsFloat(x) bit_cast<float,unsigned int>(x)
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#else
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inline int FloatAsInt(const float x)
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{
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union {
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float f;
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int i;
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} uc;
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uc.f = x;
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return uc.i;
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}
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inline float IntAsFloat(const int i)
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{
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union {
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int i;
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float f;
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} iaf;
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iaf.i = i;
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return iaf.f;
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}
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inline float UintAsFloat(const unsigned int i)
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{
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union {
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unsigned int u;
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float f;
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} iaf;
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iaf.u = i;
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return iaf.f;
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}
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#endif
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} // Util
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#endif // INCLUDED_UTIL_BITCAST_H
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