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Change the number of elements stored.
void resize( std::size_t count);
            Resizes the container to contain count
            elements. If capacity() < size() + count,
            a reallocation occurs first, and all iterators and references are invalidated.
            Any past-the-end iterators are always invalidated.
          
size()
                > count,
                the container is reduced to its first count
                elements.
              size()
                < count,
                additional null values are appended.
              
            Linear in abs(size() - count), plus the cost of reallocation if capacity() is less than count.
          
            Strong guarantee. Calls to memory_resource::allocate
            may throw.
          
| Name | Description | 
|---|---|
| 
                       | The new size of the container. |