cpp/experimental/special functions/beta

@1@ Computes the beta function of and. @2@ A set of overloads or a function template for all combinations of arguments of arithmetic type not covered by. If any argument has integral type, it is cast to. If any argument is, then the return type is also , otherwise the return type is always.

Return value
If no errors occur, value of the beta function of and, that is $$, or, equivalently, $$ is returned.

Error handling
Errors may be reported as specified in math_errhandling


 * If any argument is NaN, NaN is returned and domain error is not reported
 * The function is only required to be defined where both and  are greater than zero, and is allowed to report a domain error otherwise.