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concepts: add "supports_indexing"

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This commit is contained in:
Danny Robson 2020-03-16 14:12:04 +11:00
parent 6b53abd6b4
commit c528e28a0e
1 changed files with 7 additions and 0 deletions
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7
concepts.hpp
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@ -288,6 +288,13 @@ namespace cruft::concepts {
}; };
template <
typename ContainerT,
typename IndexT = std::size_t
>
concept supports_indexing = requires (ContainerT &t, IndexT idx) {
{ t[idx] };
};
/// A type that supports arithmetic operators. /// A type that supports arithmetic operators.