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

Concept to check if a type is pair‐like

== Synopsis

Declared in `<mrdocs/Support/Concepts.hpp>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class T>
concept pair_like = tuple_like<T> &&
    (std::tuple_size<std::remove_cvref_t<T>>::value == 2);
----

== Description

This concept checks if a type is tuple‐like and has exactly two elements.

Examples of such types are std::pair, std::array with two elements, and user‐defined types that provide specializations for std::tuple_size and std::tuple_element with exactly two elements.


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