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Fix signbit detection (#423)

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(cherry picked from commit def687462c)
This commit is contained in:
Victor Zverovich
2016-11-14 20:14:52 -08:00
committed by Jonathan Müller
parent b9a20d761a
commit baedba07ca
1 changed files with 3 additions and 1 deletions
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4
fmt/format.h
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@ -397,8 +397,10 @@ class numeric_limits<fmt::internal::DummyInt> :
// Portable version of signbit.
static bool isnegative(double x) {
using namespace fmt::internal;
if (const_check(sizeof(signbit(x)) == sizeof(int)))
if (const_check(sizeof(signbit(x)) == sizeof(bool) ||
sizeof(signbit(x)) == sizeof(int))) {
return signbit(x) != 0;
}
if (x < 0) return true;
if (!isnotanumber(x)) return false;
int dec = 0, sign = 0;