realloc in case of new and delete operators

[free2cric]

Hi, As you know memory block assigned by malloc can be resized by
realloc with previously assigned data in the memory block intact. How
this to achieve in case
if the memory block is assigned with "new" operator.
thanks crick.

 

[Karl Heinz Buchegger]

Hi, As you know memory block assigned by malloc can be resized by
realloc with previously assigned data in the memory block intact. How
this to achieve in case
if the memory block is assigned with "new" operator.

There is no way to do that with one simple call.

Allocate more memory
copy the old content to the new location
free the old memory

Or simply use a standard contained such as std::vector.
They do all of this automatically for you under the hood.