boost :: bind&具有部分args的boost :: function

时间:2012-01-31 16:19:09

标签: c++ boost boost-bind boost-function

我给你发了一个我想做的例子,用这种方式更容易解释

    void myPrinter(const char* text, int number){            
            printf("\n%s %d\n", text, number);
        }

    int main() {

        char *someText="test";        

       boost::function<void(int my_number)> functionWithSavedArgs = boost::bind(&myPrinter, someText, ?????);

       //then I have to call my function with saved args and give to it only variable "number" like:
       int myBeautifulNumber = 2012;
       functionWithSavedArgs(myBeautifulNumber);
       // echo: test 2012
     }

有什么想法吗?

1 个答案:

答案 0 :(得分:2)

跳过那个论点。

   boost::function<void(int my_number)> functionWithSavedArgs
        = boost::bind(&myPrinter, someText);

这只会绑定第一个参数。

如果您只想绑定第二个,则需要一个占位符:

   boost::function<void(int my_number)> functionWithSavedArgs
         = boost::bind(&myPrinter, _1, someNumber);