stl 向量和 C++:如何在没有默认构造函数的情况下调整大小?

2021-12-21 00:00:00 constructor default vector c++ stl

我如何告诉 STL,特别是向量中的 resize() 方法,用一个非默认的构造函数初始化对象,以及使用哪些参数?

How do I tell STL, specifically for the method resize() in vector, to initialize objects with a constructor other than default, and with which parameters?

例如:

class something {
    int a;
    something (int value);
}

std::vector<something> many_things;

many_things.resize (20);

更一般地说,当 STL 需要创建对象并将参数传递给该构造函数时,我如何强制它使用我的构造函数?

More generally, how do I force STL to use my constructor when it needs to create objects, and pass parameters to that constructor?

就我而言,添加默认构造函数不是一种选择,我不希望使用指针数组来解决问题.

In my case adding a default constructor is not an option, and I'd prefer not to use an array of pointers to solve the problem.

推荐答案

使用 2 参数重载:many_things.resize(20, something(5));

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