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Function `std.typecons.Nullable.opEquals`

If they are both null, then they are equal. If one is null and the other is not, then they are not equal. If they are both non-null, then they are equal if their values are equal.


						
				bool opEquals(This, Rhs)
				(
				

				  auto ref Rhs rhs
				

				)
				

				if (!is(CommonType!(This, Rhs) == void));
				

				

				bool opEquals(This, Rhs)
				(
				

				  auto ref Rhs rhs
				

				)
				

				if (is(CommonType!(This, Rhs) == void) && is(typeof(this.get == rhs)));

Example

Nullable!int empty;
Nullable!int a = 42;
Nullable!int b = 42;
Nullable!int c = 27;

writeln(empty); // empty
writeln(empty); // Nullable!int.init
assert(empty != a);
assert(empty != b);
assert(empty != c);

writeln(a); // b
assert(a != c);

assert(empty != 42);
writeln(a); // 42
assert(c != 42);

Authors

Andrei Alexandrescu, Bartosz Milewski, Don Clugston, Shin Fujishiro, Kenji Hara

License

Boost License 1.0.