In chapter 17 were trying to replicate std vector.Code:vector& operator=(const vector& a){ double *p=new double[a.sz]; copy(a.elem, a.elem+a.sz, elem); delete[] elem; elem=p; sz=a.sz; return *this; }
Why does it delete elem after it copies to elem? I dont get it
Exception safe assignment – Vorbrodt's C++ Blog
You delete after you copy so that if the copy assignment throws an exception, no change occurs or affects your original variable.
EDIT:
Looked at John's reply and realised I didn't look at your code correctly. If everything was written right, like John mentions to change elem to p in the copy, then you can consider my response valid.
Last edited by Zeus_; 12-14-2019 at 11:02 AM.
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." - Rick Cook, The Wizardry Compiled
The error is that it's copying to elem instead of p. Change it to p.
BTW, "chapter 17" is not some kind of universal reference. There's a lot of books out there!
A little inaccuracy saves tons of explanation. - H.H. Munro
Thx it works now
author made a typo
