Display the source code in std/traits.d from which this page was generated on github.

If you spot a problem with this page, click here to create a Bugzilla issue.

Quickly fork, edit online, and submit a pull request for this page. Requires a signed-in GitHub account. This works well for small changes. If you'd like to make larger changes you may want to consider using local clone.

Enum member `std.traits.arity`

Returns the number of arguments of function func. arity is undefined for variadic functions.


						
				enum arity(alias func)
				 = Parameters!func.length;

Example

void foo(){}
static assert(arity!foo == 0);
void bar(uint){}
static assert(arity!bar == 1);
void variadicFoo(uint...){}
static assert(!__traits(compiles, arity!variadicFoo));

Authors

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

License

Boost License 1.0.