[#btck-IndexedContainer]
= xref:btck.adoc[btck]::IndexedContainer
:relfileprefix: ../
:mrdocs:

Satisfied when a container exposes a size accessor and an indexed element accessor.

== Synopsis

Declared in `<kernel/bitcoinkernel_wrapper.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename Container,
    typename SizeFunc,
    typename GetFunc>
concept IndexedContainer = requires(const Container& c, SizeFunc size_func, GetFunc get_func, std::size_t i) {
    { std::invoke(size_func, c) } ‐> std::convertible_to<std::size_t>;
    { std::invoke(get_func, c, i) }; // Return type is deduced
};
----


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