C++ named requirements: UnaryTypeTrait (since C++11)

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Compiler support
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Language
Standard library
Standard library headers
Named requirements
Feature test macros (C++20)
Language support library
Concepts library (C++20)
Diagnostics library
Memory management library
Metaprogramming library (C++11)
General utilities library
Containers library
Iterators library
Ranges library (C++20)
Algorithms library
Strings library
Text processing library
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Date and time library
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Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
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