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Description

Finds the distance between first and last, i.e. the number of times that first must be incremented until it is equal to last. [1] The first version of distance, which takes two arguments, simply returns that distance; the second version, which takes three arguments and which has a return type of void, increments n by that distance.

The second version of distance was the one defined in the original STL, and the first version is the one defined in the draft C++ standard; the definition was changed because the older interface was clumsy and error-prone. The older interface required the use of a temporary variable, and it has semantics that are somewhat nonintuitive: it increments n by the distance from first to last , rather than storing that distance in n. [2]

Both interfaces are currently supported [3], for reasons of backward compatibility, but eventually the older version will be removed.


Prototype | Standard Template Library Programmer`s Guide | Definition







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