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std::logical_and<void>

From cppreference.com
< cpp‎ | utility‎ | functional
 
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logical_and<>
(C++14)
(C++14)
(C++14)

Old binders and adaptors
(until C++17*)
(until C++17*)
(until C++17*)
(until C++17*)
(until C++17*)  
(until C++17*)
(until C++17*)(until C++17*)(until C++17*)(until C++17*)
(until C++20*)
(until C++20*)
(until C++17*)(until C++17*)
(until C++17*)(until C++17*)

(until C++17*)
(until C++17*)(until C++17*)(until C++17*)(until C++17*)
(until C++20*)
(until C++20*)
 
Defined in header <functional>
template<>
class logical_and<void>;
 (since C++14)

std::logical_and<void> is a specialization of std::logical_and with parameter and return type deduced.

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