# std::experimental::gcd

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< cpp‎ | experimental

Defined in header `<experimental/numeric>` |  |
template< class M, class N> constexpr std::common_type_t<M, N> gcd( M m, N n ); |  | (library fundamentals TS v2)

Computes the greatest common divisor of the integers m and n.

### Parameters

m, n | - | integer values

### Return value

If both m and n are zero, returns zero. Otherwise, returns the greatest common divisor of |m| and |n|.

### Remarks

If either `M` or `N` is not an integer type, or if either is (possibly cv-qualified) bool, the program is ill-formed.

If either |m| or |n| is not representable as a value of type std::common_type_t<M, N>, the behavior is undefined.

### Exceptions

Throws no exceptions.

### See also

lcm | `constexpr` function template returning the least common multiple of two integers (function template)

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