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Template:cpp/utility/functional/member types

From cppreference.com

[edit] Member types

Type Definition
result_type (deprecated in C++17)(removed in C++20) {{{result}}}
argument_type (deprecated in C++17)(removed in C++20) {{{arg1}}}

These member types are obtained via publicly inheriting std::unary_function<, >.

(until C++11)