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Alias `std.traits.ReturnType`

Get the type of the return value from a function, a pointer to function, a delegate, a struct with an opCall, a pointer to a struct with an opCall, or a class with an opCall. Please note that ref is not part of a type, but the attribute of the function (see template functionAttributes).


						
				alias ReturnType(alias func) = CRC.R;

Note: To reduce template instantiations, consider instead using typeof(() { return func(args); } ()) if the argument types are known or static if (is(typeof(func) Ret == return)) if only that basic test is needed.

Example

int foo();
ReturnType!foo x;   // x is declared as int

Authors

Walter Bright, Tomasz Stachowiak (isExpressions), Andrei Alexandrescu, Shin Fujishiro, Robert Clipsham, David Nadlinger, Kenji Hara, Shoichi Kato

License

Boost License 1.0.