std::vector::push_back
void push_back( const T& value ); | (1) | |
|---|---|---|
void push_back( T&& value ); | (2) | (since C++11) |
追加给定元素value容器的末端。
1%29新元素初始化为value...
2%29value被移到新元素中。
如果新的size()大于capacity()然后，所有迭代器和引用%28，包括过去-结束迭代器%29无效。否则，只有过去结束迭代器无效。
参数
value | - | the value of the element to append |
|---|
类型要求
T必须满足CopyInsertable的要求才能使用过载%281%29。
T必须满足MoveInsertable的要求才能使用过载%282%29。
返回值
%280%29
复杂性
摊销常数
例外
如果抛出异常%28，这可能是Allocator::allocate()或元素复制/移动构造函数/赋值%29，此函数不具有%28强异常保证%29的效果。
If T's move constructor is not noexcept and T is not CopyInsertable into *this, vector will use the throwing move constructor. If it throws, the guarantee is waived and the effects are unspecified. | (since C++11) |
|---|
注记
一些实现也会抛出std::length_error何时push_back导致重新分配的值超过max_size，由于隐式调用reserve(size()+1)...
例
二次
#include <vector>
#include <iostream>
#include <iomanip>
int main()
{
std::vector<std::string> numbers;
numbers.push_back("abc");
std::string s = "def";
numbers.push_back(std::move(s));
std::cout << "vector holds: ";
for (auto&& i : numbers) std::cout << std::quoted(i) << ' ';
std::cout << "\nMoved-from string holds " << std::quoted(s) << '\n';
}二次
产出：
二次
vector holds: "abc" "def"
Moved-from string holds ""二次
另见
emplace_back (C++11) | constructs an element in-place at the end (public member function) |
|---|---|
pop_back | removes the last element (public member function) |
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