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Looking through the C++ vector documents, pop_back() is a function that will not cause a reallocation of the vector's data. However, this only works for removing one member of the vector. I am trying to find a way to erase multiple members from the end of a vector. Originally I thought I would call pop_back() in a small for loop but I was wandering if there was a more convenient function that would do this for me?
Edit: The Cplusplus vector erase() reference is not as clear as it should be as pointed out by juanchopanza. It is why I originally discarded using erase(). Erase afterall, works well.
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pop_back() function is used to pop or remove elements from a vector from the back. The value is removed from the vector from the end, and the container size is decreased by 1.
vector::erase() erase() function is used to remove elements from a container from the specified position or range.
vector::erase Erases the specified elements from the container. 1) Removes the element at pos. 2) Removes the elements in the range [first, last) . Invalidates iterators and references at or after the point of the erase, including the end() iterator.
Use vector::erase. It will not reallocate memory.
If your erased range does not extend to the end of the container, it WILL re-locate the end elements. That means the ending elements will be moved to their proper spot in memory which likely incurs a data copy. That is not the same as a re-allocation of the backing store. If your ending element is myVector.end(), no relocation will need to occur.
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