erase_if(std::unordered_map<Key, T, Hash, KeyEqual, Alloc>&c, Pred pred); (since C++20) Erases all elements that satisfy the predicatepredfromc. Equivalent to autoold_size=c.size();for(autofirst=c.begin(), last=c.end();first!=last;){if(pred(*first))first=c.erase(first);else...
erase_if(std::forward_list<T, Alloc>&c, Pred pred); (2)(C++20 起) 1)从容器中擦除所有比较等于value的元素。等价于returnc.remove_if([&](constauto&elem)->bool{returnelem==value;});。 2)从容器中擦除所有满足pred的元素。等价于returnc.remove_if(pred);。
{3, 3, 4, 5, 5, 6, 6, 7, 2, 1, 0}; println("Original:\n", data); auto divisible_by_3 = [](auto const& x) { return (x % 3) == 0; }; const auto count = std::erase_if(data, divisible_by_3); println("Erase all items divisible by 3:\n", data); std::cout ...
std::map<Key, T, Compare, Alloc>::size_type erase_if( std::map<Key, T, Compare, Alloc>& c,Pred pred );(C++20 起) 从c 中擦除所有满足谓词 pred 的元素。 等价于 auto old_size = c.size(); for (auto first = c.begin(), last = c.end(); first != last;) { if (pred(...
erase(std::vector)erase_if(std::vector) (C++20) erases all elements satisfying specific criteria (function template) Deduction guides (since C++17) Notes Feature-testmacroValueStdFeature __cpp_lib_containers_ranges202202L(C++23)Ranges construction and insertion for containers ...
3)Iterator pointing to the characterlastpointed to before the erase, orend()if no such character exists. Exceptions 1)std::out_of_rangeifindex>size(). 2,3)Throws nothing. If an exception is thrown for any reason, this function has no effect (strong exception safety guarantee). ...
2、算法(algorithms):各种常用算法,如:sort、search、copy、erase。从实现的角度来看,STL算法是一种 function template。注意一个问题:任何的一个STL算法,都需要获得由一对迭代器所标示的区间,用来表示操作范围。这一对迭代器所标示的区间都是前闭后开区间,例如[first, last) 3、迭代器(iterators):容器与算法之间...
std::deque<T, Alloc>::size_type erase_if( std::deque<T, Alloc>& c, Pred pred ); (2) (since C++20) 1) Erases all elements that compare equal to value from the container. Equivalent to auto it = std::remove(c.begin(), c.end(), value); auto r = c.end() - it; c....
{5, 'g'}, {5, 'g'}, }; println("Original:\n", data); const auto count = std::erase_if(data, [](const auto& item) { auto const& [key, value] = item; return (key & 1) == 1; }); println("Erase items with odd keys:\n", data); std::cout << count << " items...
调用remove之后通常跟随调用容器的erase成员函数来从容器中实际移除元素。这两个调用一并被称为擦除移除手法。 以下非成员函数也可以达到相同的效果: std::erase,它对所有标准序列容器都有重载。 std::erase_if,它对所有标准容器都有重载。 (C++20 起) ...