Mojo trait
StringableRaising
The StringableRaising trait describes a type that can be converted to a String.
Any type that conforms to
Stringable or
StringableRaising works with the built-in
print() and
String() functions.
The StringableRaising trait requires the type to define the __str__()
method, which can raise an error. For example:
@value
struct Foo(StringableRaising):
var s: String
fn __str__(self) raises -> String:
if self.s == "":
raise Error("Empty String")
return self.s
@value
struct Foo(StringableRaising):
var s: String
fn __str__(self) raises -> String:
if self.s == "":
raise Error("Empty String")
return self.s
Now you can pass an instance of Foo to the String() function to get back a
String:
fn main() raises:
var foo = Foo("test")
print(String(foo) == "test")
fn main() raises:
var foo = Foo("test")
print(String(foo) == "test")
True
True
Implemented traits
AnyType,
UnknownDestructibility
Methods
__str__
__str__(self: _Self) -> String
Get the string representation of the type.
Returns:
The string representation of the type.
Raises:
If there is an error when computing the string representation of the type.
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