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maths: add some comments to rounding functions

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This commit is contained in:
Danny Robson 2017-08-30 15:23:42 +10:00
parent 0f4fece00f
commit 4826b4c466
1 changed files with 7 additions and 7 deletions
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14
maths.hpp
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@ -253,7 +253,7 @@ namespace util {
/////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////
// Rounding /// round T up to the nearest multiple of U
template <typename T, typename U> template <typename T, typename U>
inline inline
typename std::common_type< typename std::common_type<
@ -262,14 +262,13 @@ namespace util {
>::type >::type
round_to (T value, U size) round_to (T value, U size)
{ {
if (value % size == 0) auto remainder = value % size;
return value; return value + size - remainder;
return value + (size - value % size);
} }
//----------------------------------------------------------------------------- ///----------------------------------------------------------------------------
/// round T up to the nearest power-of-2
template <typename T> template <typename T>
constexpr constexpr
std::enable_if_t< std::enable_if_t<
@ -290,7 +289,8 @@ namespace util {
} }
//----------------------------------------------------------------------------- ///----------------------------------------------------------------------------
/// round T up to the nearest multiple of U and return the quotient.
template <typename T, typename U> template <typename T, typename U>
constexpr std::enable_if_t< constexpr std::enable_if_t<
std::is_integral<T>::value && std::is_integral<T>::value &&