nerdcruft/libcruft-util
1
0
Fork 0
Code Issues Releases Activity

iterator: add index_type trait

Browse Source
This commit is contained in:
Danny Robson 2018-06-27 17:56:19 +10:00
parent 279af4c796
commit 4094a96160
1 changed files with 18 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
iterator.hpp
View File

@ -229,6 +229,24 @@ namespace util {
} }
///////////////////////////////////////////////////////////////////////////
/// a trait that stores a type suitable for indexing a container
template <typename, typename = std::void_t<>>
struct index_type { using type = std::size_t; };
//-------------------------------------------------------------------------
template <typename ContainerT>
struct index_type<
ContainerT,
std::void_t<
typename ContainerT::index_t
>
> {
using type = typename ContainerT::index_t;
};
/////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////
template <typename ContainerT> template <typename ContainerT>
class indices { class indices {