基于函数返回的stl容器构造效率(Efficiency of construction of stl container based on a function return)

 我有一个返回stl容器的工厂函数： 
 
const std::vector<int> f(...) {
    std::vector<int> retval;
    return retval;
}
 
 我想可以定义一个stl实例如下（没有错误）： 
 
const std::vector<int> stl_instance(f(...));
 
 但这样做有效吗？ 
 
 临时stl对象是否直接分配给stl_instance ？ 

I have a factory function which return a stl container:
 
const std::vector<int> f(...) {
    std::vector<int> retval;
    return retval;
}
 
I guess it is ok to define a stl instance as follow(no error):
 
const std::vector<int> stl_instance(f(...));
 
But is it efficient to do so?
 
Is the temporary stl object directly assigned to stl_instance?

原文：https://stackoverflow.com/questions/14251010