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std::stoppable_token - cppreference.com

From cppreference.com

Defined in header <stop_token>

template< class Token >
concept stoppable_token =
    requires (const Token tok) {
        typename /*check-type-alias-exists*/<Token::template callback_type>;
        { tok.stop_requested() } noexcept -> std::same_as<bool>;
        { tok.stop_possible() } noexcept -> std::same_as<bool>;
        { Token(tok) } noexcept; // see implicit expression variations
    } &&
    std::copyable<Token> &&
    std::equality_comparable<Token>;
(since C++26)

Helper templates

template< template<class> class >
struct /*check-type-alias-exists*/; // not defined
(exposition only*)

The concept stoppable_token<Token> specifies the basic interface of a stop token that is copyable and equality_comparable and allows polling to see if the stop request is possible and whether the request has been made.

Semantic requirements

See also