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maths: explanatory header for sign()

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This commit is contained in:
Danny Robson 2015-11-16 17:57:53 +11:00
parent 486cefc4c6
commit 8e2c5f1942
1 changed files with 6 additions and 2 deletions
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8
maths.hpp
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@ -135,7 +135,8 @@ namespace util {
digits (const T& value);
//-----------------------------------------------------------------------------
///----------------------------------------------------------------------------
/// return positive or negative unit value corresponding to the input.
template <typename T>
constexpr std::enable_if_t<
std::is_signed<T>::value && std::is_integral<T>::value, T
@ -145,7 +146,10 @@ namespace util {
return t < 0 ? -1 : 1;
}
//-------------------------------------------------------------------------
///------------------------------------------------------------------------
/// return positive or negative unit value corresponding to the input.
/// guaranteed to give correct results for signed zeroes, use another
/// method if extreme speed is important.
template <typename T>
constexpr std::enable_if_t<
std::is_floating_point<T>::value, T