CODEWITHSUNDEEP
c++vectorstl
OldMcFartigan
OldMcFartigan

Reputation: 129

C++ Replace dynamic objects in vector

I'm wondering if I replace a dynamically allocated object in a vector with another, does the object get deleted or do I have to do it myself?

vector<thingamajig*> myvec;

... 

myvec[17] = new thingamajig(paramsA);

...

myvec[17] = new thingamajig(paramsB); //what happens to the previous thingamajig?

Is this a memory leak? I don't understand vectors well enough to know if it'll delete thingamajig(paramsA) automatically or not. If not what is the proper way to clean the old one up?

Upvotes: 2

Views: 138

Answers (1)

billz
billz

Reputation: 45410

what happens to the previous thingamajig

You lost the pointer to previous myvec[17] thus causes memory leak.

You'd better use smart pointer in std::vector

#include <memory>
#include <vector>
std::vector<std::unique_ptr<thingamajig>> myvec;

myvec[17].reset(new thingamajig(paramsB));

Upvotes: 1

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