STL 多图删除/擦除值

问题描述

我有 STL Multimap，我想从映射中删除具有特定值的条目，我不想删除整个键，因为该键可能映射到其他需要的值.

I have STL Multimap, I want to remove entries from the map which has specific value , I do not want to remove entire key, as that key may be mapping to other values which are required.

请提供任何帮助.

推荐答案

如果我理解正确，这些值可以出现在任何键下.如果是这种情况，您将不得不迭代您的多重映射并删除特定值.

If I understand correctly these values can appear under any key. If that is the case you'll have to iterate over your multimap and erase specific values.

typedef std::multimap<std::string, int> Multimap;
Multimap data;

for (Multimap::iterator iter = data.begin(); iter != data.end();)
{
    // you have to do this because iterators are invalidated
    Multimap::iterator erase_iter = iter++;

    // removes all even values
    if (erase_iter->second % 2 == 0)
        data.erase(erase_iter);
}

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