27 Algorithms library [algorithms]

27.10 Generalized numeric operations [numeric.ops]

27.10.16 Midpoint [numeric.ops.midpoint]

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template<class T> constexpr T midpoint(T a, T b) noexcept;
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Constraints: T is an arithmetic type other than bool.
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Returns: Half the sum of a and b.
If T is an integer type and the sum is odd, the result is rounded towards a.
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Remarks: No overflow occurs.
If T is a floating-point type, at most one inexact operation occurs.
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template<class T> constexpr T* midpoint(T* a, T* b);
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Constraints: T is an object type.
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Mandates: T is a complete type.
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Preconditions: a and b point to, respectively, elements i and j of the same array object x.
[Note 1: 
As specified in [basic.compound], an object that is not an array element is considered to belong to a single-element array for this purpose and a pointer past the last element of an array of n elements is considered to be equivalent to a pointer to a hypothetical array element n for this purpose.
— end note]
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Returns: A pointer to array element of x, where the result of the division is truncated towards zero.