3)find_if搜索谓词p对其返回true的元素。 5)find_if_not搜索谓词q对其返回false的元素。 2,4,6)同(1,3,5),但按照policy执行。 这些重载只有在满足以下所有条件时才会参与重载决议: std::is_execution_policy_v<std::decay_t<ExecutionPolicy>>是true。
Complexity Constant on average, worst case linear in the size of the container. Notes Feature-testmacroValueStdFeature __cpp_lib_generic_unordered_lookup201811L(C++20)Heterogeneous comparison lookup inunordered associative containers; overloads(3,4) ...
1,2)寻找键等价于key的的元素。 3,4)寻找键比较等价于值x的元素。此重载只有在Hash::is_transparent与KeyEqual::is_transparent均合法并指代类型时才会参与重载决议。这假设使得Hash能用K和Key类型调用,并且KeyEqual是透明的,进而允许调用此函数时不需要构造Key的实例。
Complexity Constant on average, worst case linear in the size of the container. Notes Feature-testmacroValueStdFeature __cpp_lib_generic_unordered_lookup201811L(C++20)Heterogeneous comparison lookup inunordered associative containers; overloads(3,4) ...
参见:https://en.cppreference.com/w/cpp/algorithm/find 查找指定字符/数字等。 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 #include <iostream> #include <algorithm> #include <vector> #include <iterator> intmain()
API Reference Document std::find, std::find_if, std::find_if_notC++ Algorithm library Defined in header <algorithm> (1) template< class InputIt, class T > InputIt find( InputIt first, InputIt last, const T& value ); (until C++20) template< class InputIt, class T > constexpr...
Dec 23, 2023, 6:24 PM >for what is setprecision? https://cplusplus.com/reference/iomanip/setprecision/ https://en.cppreference.com/w/cpp/io/manip/setprecision Wayne 1 voteReport a concern Question activity Sign in to follow questions and users...
1,2)Finds an element with key equivalent tokey. 3,4)Finds an element with key that comparesequivalentto the valuex. This overload only participates in overload resolution if the qualified-idCompare::is_transparentis valid and denotes a type. It allows calling this function without constructing...
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std::find算法试图将来自m_notes的元素与x进行比较，但是您没有提供operator==来实现它，因此出现了错误...