expect

Unwraps a result, yielding the content of expected value. If there is none, or error value, it throws assert(0) with the provided message.

T expect(EX res, string msg)
T expect(EX res)
ref
T
expect
(
alias handler
EX : Expected!(T, E, H)
T
E
H
)
(
auto ref EX res
)

Parameters

res EX: Expected to check the result of
handler: custom handler to be called on error

Examples

assert(ok(42).expect("oops") == 42);
ok().expect("oops"); // void value
() @trusted
{
    assert(collectExceptionMsg!Throwable(Expected!int.init.expect("oops")) == "oops: empty");
    assert(collectExceptionMsg!Throwable(err!int("foo").expect("oops")) == "oops: foo");
}();

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