有没有这样的事情作为一个C＃风格的扩展方法在C + +？ [英] Is there such a thing as a C# style extension method in C++?

问题描述

我目前正在学习C ++，我遇到了一个简单的问题，将int转换为字符串。我使用下面的工具：

  string IntToString（int Number）
 {
 stringstream Stream; 
 Stream<<数; 
 return Stream.str（）; 
} 
  

但是使用类似的东西会更加优雅：

  int x = 5; 
 string y = x.toString（）; 
  

但是如何添加 toString（）方法到内置类型

或者我缺少完全基本的东西？

解决方案

我不会从basic_string / string派生任何类。这不是推荐，并且在字符串中没有方法是虚拟的，它没有虚拟析构函数（因此导出可能会在内存泄漏）。

/ p>

您可以创建一个静态类（只包含静态方法的类），以便将其保存在一个地方。使用方法重载int，float，double等。

  class Converter {
 private：
 Converter （）{} 
 
 public：
 static string toString（int i）{
 ...您的实现... 
} 
 $ b b static string toString（float f）{
 ... same but floatats。 
} 
 .... other overloads .... 
}; 
 
 ...你的代码中的其他地方.... 
 
 string c = Converter :: toString（5）; 
  

I'm currently learning C++ and i run into the simple problem of converting an int to a string. I've worked around it using:

string IntToString(int Number)
{
    stringstream Stream;
    Stream << Number;
    return Stream.str();
}

but though it would be more elegant to use something like:

int x = 5;
string y = x.toString();

but how do i add the toString() method to a built in type?

or am i missing something totally fundamental?

解决方案

I would not derive any class from basic_string/string. This is not recommended and no method in string is virtual, it does not have a virtual destructor (hence deriving could reault in memory leaks)

Make it pretty for yourself:

You could create a static class (class containing only static methods) in order keep it all in the one place. Use method overloading for int, float, double, etc.

class Converter {
   private:
       Converter() {}

   public:
     static string toString(int i) {
        ... your implementation ...
     }

     static string toString(float f) {
        ... same but floats.
     }
     .... other overloads ....
};

... somewhere else in your code ....

string c = Converter::toString(5);

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