带有前缀填充的 C++ 输出

Question

如何在 C++ 中打印带填充的字符串？具体我想要的是:

cout << "something in one line (no prefix padding)"
cout << "something in another line (no prefix padding)"
set_padding(4)
    cout << "something with padding"
    cout << "something with padding"
set_padding(8)
        cout << "something with padding"
        cout << "something with padding"

也就是说，我会多次调用 cout 而我不想调用 setw(len) << ""每时每刻。

Answer 1

我想你可以让预处理器为你输入:

#include <iostream>
#define mout std::cout << std::string(width,' ')
#define mndl "\n" << std::string(width,' ')

int width=0;

int main()
{
    mout << "Hello" << std::endl; 

    width = 8;

    mout << "World." << mndl << "Next line--still indented";
    // more indented lines...
}