CODEWITHSUNDEEP
c++loopsc++11vectorauto
Nick Savage
Nick Savage

Reputation: 876

Does the 'auto' keyword know when to use a const iterator?

If you're looping through a container as such:

typedef std::vector<std::unique_ptr<BaseClass>> Container;
Container container;

for(Container::const_iterator element = container.begin(); element != container.end(); element++)
{
    //Read through values
}

And instead of using the typedef you decide to use auto:

std::vector<std::unique_ptr<BaseClass>> container;

for(auto element = container.begin(); element != container.end(); element++)
{
    //Read through values
}

Assuming you don't alter the values, does the auto keyword use a const iterator over a non const one?

This question is curiosity more than anything, the only reason I can see this being an applicable question in a real life scenario would be if you needed to communicate that you weren't to alter values to another person working on the code.

Upvotes: 3

Views: 2970

Answers (1)

segfault
segfault

Reputation: 5939

1) Use cbegin and cend to be explicit about using const iterator.

2) begin() and end() return const_iterator when method is declared as const

Upvotes: 8

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