小编Jag*_*ish的帖子

我试图理解Vector C++ 中的emplace_backvs。push_back虽然emplace_back和push_back的整个过程都是在最后追加数据，但从我对emplace的理解来看，它没有创建临时对象。但是当我看到日志时，两种行为保持不变，需要帮助理解 emplace_back 与 Push_back

#include <iostream>
#include <vector>

using namespace std;

struct Foo
{
    int myint;

    Foo(int n) 
    {
        cout << "constructor called " << this << endl;
        myint = n;
    }

    Foo(const Foo& rhs ) 
    {
        cout << "copy constructor called " << this << endl;
        myint = rhs.myint;
    }

    void display() {
        cout << "in Display Foo int = " << myint << endl;
    }

};


int main()
{
    cout<<"********emplace example start …