updated stl and templates#55
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updated info about contains and erase_if
…06.2026 Update 15_stl.md updated info about contains and erase_if
updated info about NTTP
vmedv
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Jun 30, 2026
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| В *C++20* нестатический шаблонный параметр может быть объявлен как auto, позволяя выводить тип из аргумента. Например: | ||
| ```cpp | ||
| template <auto N> struct S { | ||
| static constexpr auto value = N; | ||
| }; | ||
| ``` | ||
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vmedv
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Jun 30, 2026
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| В *C++20* ассоциативные контейнеры `(std::map, std::unordered_map, std::set, std::unordered_set)` получили метод `contains(key)`, который возвращает `bool`, проверяя наличие ключа. Это удобнее и читаемее, чем `count(key) > 0` или `find(key) != end()`. | ||
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| Начиная с *C++20*, для всех контейнеров появилась функция `std::erase_if`. Например, std::erase_if(v, pred); выполняет удаление за один вызов, что проще, чем комбинация `remove_if + erase`. |
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std::erase_if(v, pred); стоит сделать моноширинным
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