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Avoid technically UB type punning when determining endianness

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Martin Hořeňovský 2019-10-27 22:07:10 +01:00
parent 2fbd66c51c
commit 7ada02e21e
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1 changed files with 7 additions and 9 deletions
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16
include/internal/catch_tostring.cpp
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@ -38,13 +38,11 @@ namespace Detail {
enum Arch { Big, Little };
static Arch which() {
union _{
int asInt;
char asChar[sizeof (int)];
} u;
u.asInt = 1;
return ( u.asChar[sizeof(int)-1] == 1 ) ? Big : Little;
int one = 1;
// If the lowest byte we read is non-zero, we can assume
// that little endian format is used.
auto value = *reinterpret_cast<char*>(&one);
return value ? Little : Big;
}
};
}
@ -241,13 +239,13 @@ std::string StringMaker<std::nullptr_t>::convert(std::nullptr_t) {
}
int StringMaker<float>::precision = 5;
std::string StringMaker<float>::convert(float value) {
return fpToString(value, precision) + 'f';
}
int StringMaker<double>::precision = 10;
std::string StringMaker<double>::convert(double value) {
return fpToString(value, precision);
}