强制std :: vector释放它的内存？ [英] Force a std::vector to free its memory?

问题描述

可能的重复项：

减少stl向量的容量

我知道当你调用vector.clear（）时，std :: vector不会释放内存，但是我该怎么做呢？我想让它释放所有的资源，一旦我清除它，但我不想毁灭它。

I know that std::vectors do not 'free' the memory when you call vector.clear(), but how can I do this? I want it to release all of its resources once I clear it but I don't want to destroy it.

这里是现在发生了什么。
我有一个类叫OGLSHAPE，我把它们推入它们的向量。我希望，一旦我做了shapevec.clear（）我会得到我的记忆，但只有3/4的回来。我不是100％肯定如果这是一个内存泄漏或不是所以我想释放所有的资源，以确保它不是一个泄漏。感谢

Here is what is happening right now. I have a class called OGLSHAPE and I push these into a vector of them. I was hoping that once I did shapevec.clear() I'd get all my memory back, but only got 3/4 of it back. I'm not 100% sure if this is a memory leak or not so I want to free all the resources to be sure its not a leak. Thanks

推荐答案

使用交换技巧：

#include <vector>

template <typename T>
void FreeAll( T & t ) {
    T tmp;
    t.swap( tmp );
}

int main() {
    std::vector <int> v;
    v.push_back( 1 );
    FreeAll( v );
}

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