c++ - 函数调用运算符

Question

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Answer 1

该运算符将您的对象变成仿函数。 Here is nice example of how it is done.

下一个示例演示如何实现一个类以将其用作仿函数:

#include <iostream>

struct Multiply
{
    double operator()( const double v1, const double v2 ) const
    {
        return v1 * v2;
    }
};

int main ()
{
    const double v1 = 3.3;
    const double v2 = 2.0;

    Multiply m;

    std::cout << v1 << " * " << v2 << " = "
              << m( v1, v2 )
              << std::endl;
}