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std::ref, std::cref

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)
Reference wrappers
(C++11)
refcref
(C++11)(C++11)
(C++20)(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)
(C++14)