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std::logical_and<void>

From cppreference.com
< cpp‎ | utility‎ | functional
 
C++
 
Utilities library
General utilities
Relational operators (deprecated in C++20)
 
Function objects
Function invocation
(C++17)(C++23)
Identity function object
(C++20)
Transparent operator wrappers
(C++14)
(C++14)
(C++14)
(C++14)  
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
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(C++14)
(C++14)
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(C++14)
logical_and<>
(C++14)
(C++14)
(C++14)

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