Boost.Bind to access std::map elements in std::for_each

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后悔当初 2020-12-16 03:49

I\'ve got a map that stores a simple struct with a key. The struct has two member functions, one is const the other not. I\'ve managed calling the const function using std::

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再見小時候 (楼主)

2020-12-16 04:30

If you find yourself having to do this a lot I recommend you use the Boost.RangeEx library:

#include 
#include 
#include 
#include 

struct MyStruct {
  void someConstFunction() const;
  void someFunction();
};

typedef std::map MyMap;
MyMap theMap;

int main()
{
    //call the const member function
    boost::for_each(theMap | boost::adaptors::map_values,
                    boost::mem_fn(&MyStruct::someConstFunction));

    //call the non-const member function
    boost::for_each(theMap | boost::adaptors::map_values,
                    boost::mem_fn(&MyStruct::someFunction));
}

It's been accepted into Boost but it doesn't come with the official distribution yet. Until it does you can download it from the Boost Vault (download link to zip file).

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