简单的 C++:如何重载乘法运算符,以便 float*myClass 和 myClass*float 工作

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时间:2020-08-27 13:56:08  来源:igfitidea点击:

simple c++: How to overload the multiplication operator so that float*myClass and myClass*float works

c++operator-overloading

提问by user52343

class MyClass;

int main()
{
  float a = 5;
  MyClass c1;
  MyClass c2 = a*c1;
  MyClass c3 = c1*a;
}

How can I overload the multiply operator so that both a*c1 and c1*a work?

如何重载乘法运算符以便 a*c1 和 c1*a 都能工作?

回答by Luchian Grigore

Like so:

像这样:

MyClass operator* (float x, const MyClass& y)
{
    //...
}

MyClass operator* (const MyClass& y, float x)
{
    //...
}

The second one can also be a member function:

第二个也可以是成员函数:

class MyClass
{
    //...
    MyClass operator* (float x);
};

The first 2 options work as declarations outside of class scope.

前 2 个选项用作类范围之外的声明。