For example, in <algorithm>, the function equal_range returns a pair, so can I assume that if I #include <algorithm>, <utility> is #included?
For example, in <algorithm> , the function equal_range returns a pair , so can
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For example, in <algorithm>, the function equal_range returns a pair, so can I assume that if I #include <algorithm>, <utility> is #included?
You should always include what you need, you cannot rely on all implementations including the same set of headers in another header.
In your example, if a function returns a pair you can be reasonably sure that the
pairclass is declared, but nothing requires the implementation to include the rest of<utility>.In fact, it is impossible to implement the standard library using exactly the headers shown in the standard, because there are some circular references. Implementations must split them in smaller parts, and include those sub-headers in the required
<>headers.The GCC team, for example, is working to minimize the amount of inclusions to speed up compile time.