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boolean-testable

From cppreference.com
< cpp‎ | concepts
 
C++
 
Concepts library
Exposition-only concepts
boolean-testable
 (C++20)
 
template< class B >
concept __boolean_testable_impl = std::convertible_to<B, bool>;
 (1) (since C++20)
(exposition only*)
template< class B >

concept boolean-testable =
    __boolean_testable_impl<B> &&
    requires (B&& b) {
        { !