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Enum member std.sumtype.canMatch

True if handler is a potential match for Ts, otherwise false.

enum canMatch(alias handler, Ts...) = is(typeof((Ts args) => handler(args)));

See the documentation for [match] for a full explanation of how matches are chosen.

Example

alias handleInt = (int i) => "got an int";

assert( canMatch!(handleInt, int));
assert(!canMatch!(handleInt, string));

Authors

Paul Backus

License

Boost License 1.0