C Vector Erase Iterator

Iterators specifying a range within the vector to be removed. The reason for this is that std vector behaves basically like a big heap allocated buffer and calling resize on the vector is allowed to do the equivalent of realloc 1 on the. 首先我们先来看一下两个函数iterator erase iterator position iterator erase iterator first iterator last erase erase函数可以用于删除vector容器中的一个或者一段元素在删除一个元素的时候其参数为指向相应元素的迭代器而在删除一段元素的时候参数为指向一段元素的开头的迭代器以及指向结尾元.

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C Vector Erase Function

It 값이 사라져버리는 것이다.

C vector erase iterator. If 삭제의 조건문 it vec erase it else it 여기선 신기하게 erase의 반환값을 다시 it에 대입시킨다. Show what s left actually nothing. C 11 forward iteration for auto pos v cbegin. Pos type of pos is vector t const iterator pos 5.

1 c 03 iterator erase. Erasing an empty range is a no op. The third bug is that once you call std vector erase on a collection all iterators and const iterators into that collection become unusable. Output the contents of the dynamic vector or display a message if the vector is empty.

Iterator erase iterator position. Void showvector intvector thevector first see if there s anything in the vector. 删除指定位置position的元素并返回删除元素的下一个元素的迭代器 iterator erase iterator first iterator last. Member types iterator and const iterator are random access iterator types that point to elements.

两个重载 iterator erase iterator position. Thus the end iterator which is valid but is not dereferenceable cannot be used as a value for pos. Since c 11 the cbegin and cend methods allow you to obtain a constant iterator for a vector even if the vector is non const. The standard terminology for this is that erase invalidates iterators.

Invalidates iterators and references at or after the point of the erase including the end iterator. If thevector empty cout endl thevector is empty. The iterator first does not need to be dereferenceable if first last. 2019年12月18日 08時59分28秒 akira takahashi が更新履歴編集 function vector std.

Using iterator erase iterator first iterator last to delete a range of elements all at once. I e the range includes all the elements between first and last including the element pointed by first but not the one pointed by last. 해당 iterator의 요소를 삭제해버리면 그 iterator는 무효화가 된다. The iterator pos must be valid and dereferenceable.

A constant iterator allows you to read but not modify the contents of the vector which is useful to enforce const correctness.