‘size_t’ vs ‘container::size_type’

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The standard containers define size_type as a typedef to Allocator::size_type (Allocator is a template parameter), which for std::allocator<T>::size_type is typically defined to be size_t (or a compatible type). So for the standard case, they are the same.

However, if you use a custom allocator a different underlying type could be used. So container::size_type is preferable for maximum generality.

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