Question

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remove_if equivalent for std::map

Yesterday i wrote a program, which use multiset for storing elements like this:

std::multiset < boost::shared_ptr < CEntity > > m_Entities;

Then i try to use standard algorithm remove_if like this:

std::remove_if(m_Entities.begin, m_Entities.end(), MarkedForDestroy);

BUT compilation failed, because if we see in GCC 4.4 implementaion of set and multiset we see that:

typedef typename _Rep_type::const_iterator            iterator;
typedef typename _Rep_type::const_iterator            const_iterator;

I was shocked. I google this moment and better that i found that this does not contradict the standard. The same for set.

How this cannot contradict if standart algorithms doesnt work? How i can better change container?

Answer 1

You can not use std::remove_if algorithm on an associative container. You need to a write a for loop and use the erase method to remove the elements. See this similar question remove_if equivalent for std::map for more details.