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Showing content from https://timsong-cpp.github.io/cppwp/n4140/logical.operations below:

[logical.operations]

20.9.6 Logical operations [logical.operations]

The library provides basic function object classes for all of the logical operators in the language ([expr.log.and], [expr.log.or], [expr.unary.op]).

template <class T = void> struct logical_and { constexpr bool operator()(const T& x, const T& y) const; typedef T first_argument_type; typedef T second_argument_type; typedef bool result_type; };

operator() returns x && y.

template <class T = void> struct logical_or { constexpr bool operator()(const T& x, const T& y) const; typedef T first_argument_type; typedef T second_argument_type; typedef bool result_type; };

operator() returns x || y.

template <class T = void> struct logical_not { constexpr bool operator()(const T& x) const; typedef T argument_type; typedef bool result_type; };

template <> struct logical_and<void> { template <class T, class U> constexpr auto operator()(T&& t, U&& u) const -> decltype(std::forward<T>(t) && std::forward<U>(u)); typedef unspecified is_transparent; };

operator() returns std::forward<T>(t) && std::forward<U>(u).

template <> struct logical_or<void> { template <class T, class U> constexpr auto operator()(T&& t, U&& u) const -> decltype(std::forward<T>(t) || std::forward<U>(u)); typedef unspecified is_transparent; };

operator() returns std::forward<T>(t) || std::forward<U>(u).

template <> struct logical_not<void> { template <class T> constexpr auto operator()(T&& t) const -> decltype(!std::forward<T>(t)); typedef unspecified is_transparent; };

operator() returns !std::forward<T>(t).


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