C++问题。make_pair 为什么曾经存在过? pair 可以直接代替啊? - V2EX
northisland

C++问题。make_pair 为什么曾经存在过? pair 可以直接代替啊?

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  •   northisland Jun 28, 2017 2728 views
    This topic created in 3254 days ago, the information mentioned may be changed or developed.

    我这个 C++小菜鸟,觉得

    make_pair<int, int>(0, 1) 

    pair<int, int>(0, 1) 

    执行效果是一样的啊,

    • 为什么历史上会存在 make_pair 这种函数?

    • 今后 make_pair 是不是要被逐渐淘汰?

    • 有人能讲讲 make_shared 发生了什么就更好了,,,我的猜想是把一个栈内存的对象,搞到堆里去。

    5 replies    2017-06-28 18:46:41 +08:00
    wangjxxx
        2
    wangjxxx  
       Jun 28, 2017   1
    Effective modern c++
    gnaggnoyil
        3
    gnaggnoyil  
       Jun 28, 2017 via Android   1
    template function 可以省略模板参数由编译器帮助推断,而 template class 则不行,除了 c++17 新加的那个 deduction guide
    gnaggnoyil
        4
    gnaggnoyil  
       Jun 28, 2017 via Android
    所以,make_pair 将来确实会消亡,但
    gnaggnoyil
        5
    gnaggnoyil  
       Jun 28, 2017 via Android
    那也主要是 deduction guide 的原因,而不是楼主说的那样
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