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extent: add make_extent call

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we use this until template constructor guides are available in our
supported compilers
This commit is contained in:
Danny Robson 2017-07-28 14:14:08 +10:00
parent f39f7d7362
commit bdd2e06044
1 changed files with 33 additions and 1 deletions
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34
extent.hpp
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@ -82,6 +82,32 @@ namespace util {
extent<S,T> m_target;
};
/// create an extent from supplied arguments, optionally specifying the
/// underlying type.
///
/// much like experimental::make_array we use a void type to signal we
/// need to deduce the underlying type.
template <
typename _T = void,
typename ...Args
>
auto
make_extent (Args &&...args)
{
using T = std::conditional_t<
std::is_void_v<_T>,
std::common_type_t<Args...>,
_T
>;
return extent<sizeof...(Args),T> {
std::forward<Args> (args)...
};
}
///////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
extent_range<S,T>
make_range (extent<S,T> e)
@ -89,6 +115,8 @@ namespace util {
return extent_range<S,T> {e};
}
///////////////////////////////////////////////////////////////////////////
// convenience typedefs
template <typename T> using extent2 = extent<2,T>;
template <typename T> using extent3 = extent<3,T>;
@ -98,20 +126,24 @@ namespace util {
template <size_t S> using extentf = extent<S,float>;
template <size_t S> using extentd = extent<S,double>;
typedef extent2<int> extent2i;
typedef extent2<unsigned> extent2u;
typedef extent2<float> extent2f;
typedef extent2<double> extent2d;
typedef extent3<unsigned> extent3u;
typedef extent3<float> extent3f;
//-------------------------------------------------------------------------
template <typename T> using extent_range2 = extent_range<2,T>;
template <typename T> using extent_range3 = extent_range<3,T>;
using extent_range2u = extent_range2<typename extent2u::value_type>;
using extent_range2i = extent_range2<typename extent2i::value_type>;
using extent_range3u = extent_range2<typename extent3u::value_type>;
}