Why doesn't vector::clear remove elements from a vector?

Question

When I use clear() on a std::vector, it is supposed to destroy all the elements in the vector, but instead it doesn\'t.

Sample

Answer 1

try to access to an elements sup than 4 that you use for constructor may be you will get your segmentation fault An other idea from cplusplus.com:

Clear content

Removes all elements from the vector (which are destroyed), leaving the container with a size of 0.

A reallocation is not guaranteed to happen, and the vector capacity is not guaranteed to change due to calling this function. A typical alternative that forces a reallocation is to use swap:

vector().swap(x); // clear x reallocating