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    std::plus<void>

    From cppreference.com
     
    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)
    (C++14)
    (C++14)
    (C++14)