Expect

Constructors

this

this(Expected value)

this(Unexpected value)

Constructor takes a Expected and creates a success result. Or takes an E and creates an unexpected result

Alias This

Members

Functions

isExpected

bool isExpected()

Returns true if the value is expected

match

auto match()

Pass in 2 handlers, one that handles Expected` and another that handles Unexpected

opEquals

bool opEquals(Expected rhs)

bool opEquals(Unexpected rhs)

bool opEquals(AnyUnexpected)

compares a value or an unexpected value. To compare with an unepexted value you must used either Unexpected!E as the rhs or it's type contructor.

toString

string toString()

Calls std.conv.to!string on T or E

Static functions

expected

expected(auto ref V value)

Create an Expect with an expected value

unexpected

unexpected(auto ref V value)

Create an Expect with an unexpected value

1 Expect!int toInt(string str) {
2     alias Result = typeof(return);
3     import std.conv: to;
4     try {
5         return Result.expected(str.to!int);
6     } catch (Exception ex) {
7         return Result.unexpected(ex.msg);
8     }
9 }
10 
11 assert(toInt("33") == 33);
12 assert(toInt("!33") == anyUnexpected);

• unexpected

• Expect

• anyUnexpected