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random: use decltype auto for wrapper functions

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This commit is contained in:
Danny Robson 2018-11-28 15:24:01 +11:00
parent 532bd3b706
commit c7eb82c993
1 changed files with 12 additions and 5 deletions
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17
random.hpp
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@ -91,17 +91,22 @@ namespace cruft::random {
/// This is primarily a convenience helper around the uniform_distribution /// This is primarily a convenience helper around the uniform_distribution
/// type. /// type.
template <typename ValueT, typename GeneratorT> template <typename ValueT, typename GeneratorT>
auto decltype(auto)
uniform (ValueT lo, ValueT hi, GeneratorT &&gen) uniform (ValueT lo, ValueT hi, GeneratorT &&gen)
{ {
return uniform_distribution<ValueT> { lo, hi } (gen); return uniform_distribution<ValueT> { lo, hi } (
std::forward<GeneratorT> (gen)
);
} }
///------------------------------------------------------------------------ ///------------------------------------------------------------------------
/// Return a value uniformly random chosen value between lo and hi. /// Return a value uniformly random chosen value between lo and hi.
///
/// Interval bounds are treated as per the standard Generator
/// implementations; ie, inclusive for integers, exclusive upper for reals.
template <typename T> template <typename T>
auto decltype(auto)
uniform (T lo, T hi) uniform (T lo, T hi)
{ {
return uniform<T> (lo, hi, generator ()); return uniform<T> (lo, hi, generator ());
@ -115,7 +120,8 @@ namespace cruft::random {
typename GeneratorT, typename GeneratorT,
typename = std::enable_if_t<std::is_floating_point_v<ValueT>> typename = std::enable_if_t<std::is_floating_point_v<ValueT>>
> >
auto uniform (GeneratorT &&gen) decltype(auto)
uniform (GeneratorT &&gen)
{ {
return uniform<ValueT> (ValueT{0}, ValueT{1}, std::forward<GeneratorT> (gen)); return uniform<ValueT> (ValueT{0}, ValueT{1}, std::forward<GeneratorT> (gen));
} }
@ -127,7 +133,8 @@ namespace cruft::random {
typename ValueT, typename ValueT,
typename = std::enable_if_t<std::is_floating_point_v<ValueT>> typename = std::enable_if_t<std::is_floating_point_v<ValueT>>
> >
auto uniform (void) decltype(auto)
uniform (void)
{ {
return uniform<ValueT> (ValueT{0}, ValueT{1}, generator ()); return uniform<ValueT> (ValueT{0}, ValueT{1}, generator ());
} }