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Alias std.traits.FunctionTypeOf

Get the function type from a callable object func.

alias FunctionTypeOf(alias func) = Fsym;

Using builtin typeof on a property function yields the types of the property value, not of the property function itself. Still, FunctionTypeOf is able to obtain function types of properties.


Do not confuse function types with function pointer types; function types are usually used for compile-time reflection purposes.


class C
    int value() @property { return 0; }
static assert(is( typeof(C.value) == int ));
static assert(is( FunctionTypeOf!(C.value) == function ));


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


Boost License 1.0.