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A customisation point that applies a concept-enforcing property to an object.
constexpr unspecified require_concept = unspecified;
The name require_concept denotes a customization point object.
The expression asio::require_concept(E, P) for some subexpressions
E and P (with types T = decay_t<decltype(E)>
and Prop = decay_t<decltype(P)>) is expression-equivalent
to:
is_applicable_property_v<T, Prop> && Prop::is_requirable_concept
is not a well-formed constant expression with value true,
asio::require_concept(E, P) is ill-formed.
E if the expression Prop::template static_query_v<T>
== Prop::value() is a well-formed constant expression with value
true.
(E).require_concept(P) if the expression (E).require_concept(P)
is well-formed.
require_concept(E, P) if the expression require_concept(E,
P) is a valid expression with overload resolution performed in
a context that does not include the declaration of the require_concept
customization point object.
asio::require_concept(E, P) is ill-formed.
Header: asio/require_concept.hpp
Convenience header: asio.hpp