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maths: make is_pow2 constexpr

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This commit is contained in:
Danny Robson 2016-02-02 11:32:29 +11:00
parent f6fa44f54f
commit c04c56ed32
2 changed files with 6 additions and 18 deletions
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16
maths.cpp
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@ -24,22 +24,6 @@
#include <type_traits>
///////////////////////////////////////////////////////////////////////////////
template <typename T>
bool
util::is_pow2 (T value)
{
typedef typename std::enable_if<std::is_integral<T>::value, bool>::type return_type;
return (return_type)(value && !(value & (value - 1)));
}
template bool util::is_pow2 (uint8_t);
template bool util::is_pow2 (uint16_t);
template bool util::is_pow2 (uint32_t);
template bool util::is_pow2 (uint64_t);
///////////////////////////////////////////////////////////////////////////////
template <typename T>
T

8
maths.hpp
View File

@ -67,8 +67,12 @@ namespace util {
//-------------------------------------------------------------------------
template <typename T>
bool
is_pow2 (T value);
constexpr
std::enable_if_t<std::is_integral<T>::value, bool>
is_pow2 [[gnu::const]] (T value)
{
return value && !(value & (value - 1));
}
//-----------------------------------------------------------------------------