concepts: add "supports_indexing"

2020-03-16 14:12:04 +11:00 · 2020-03-16 14:12:04 +11:00 · c528e28a0e
commit c528e28a0e
parent 6b53abd6b4
1 changed files with 7 additions and 0 deletions
--- a/concepts.hpp
+++ b/concepts.hpp
@ -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.