associative_container_key_for.h

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#pragma once
 
#include <liboscar/concepts/associative_container.h>
 
#include <concepts>
#include <ranges>
 
namespace osc
{
    // Satisfied if `Key` is a valid key for the given associative
    // container `Container`.
    template<typename Key, typename Container>
    concept AssociativeContainerKeyFor = requires(Container& c, Key key) {
        requires AssociativeContainer<Container>;
        { c.find(key) } -> std::same_as<std::ranges::iterator_t<Container>>;
    };
}