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...
std::multiset<Key, Compare, Alloc>::size_type erase_if( std::multiset<Key, Compare, Alloc>& c,Pred pred );(since C++20) Erases all elements that satisfy the predicate pred from c. Equivalent to auto old_size = c.size(); for (auto first = c.begin(), last = c.end(); first...
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);。
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(...
eraseErased elements and all elements after them (includingend()). push_back,emplace_backIf the vector changed capacity, all of them. If not, onlyend(). insert,emplaceIf the vector changed capacity, all of them. If not, only those at or after the insertion point (includingend()). ...
通过源码查看,可以发现front()其实是引用类型,而std::erase本身又调用了std::__remove_if,这也不难让人想出解决问题的办法,也就是做一份拷贝。 voidmy_erase(auto&x){autotmp=x.front();std::erase(x,tmp);} 但是既然都来写Cpp了,我们还可以追求点“洁癖”,我们很多时候并不希望有多余...
通过源码查看,可以发现front()其实是引用类型,而std::erase本身又调用了std::__remove_if,这也不难让人想出解决问题的办法,也就是做一份拷贝。 voidmy_erase(auto&x){ autotmp=x.front(); std::erase(x,tmp); } 但是既然都来写Cpp了,我们还可以追求点“洁癖”,我们很多时候并不希望有多余的拷贝,这时...
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). ...
Indexing 'https://en.cppreference.com/w/cpp/experimental/basic_string/erase' (depth 3)... Indexing 'https://en.cppreference.com/w/cpp/error/nested_exception' (depth 3)... URL failed (https://en.cppreference.com/w/cpp/error/get_terminate): <urlopen error [Errno 101] Network is ...
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...