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:
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")
True
Implemented traits
AnyType
,
UnknownDestructibility
Aliases
__del__is_trivial
alias __del__is_trivial
A flag (often compiler generated) to indicate whether the implementation of __del__
is trivial.
The implementation of __del__
is considered to be trivial if:
- The struct has a compiler-generated trivial destructor and all its fields
have a trivial
__del__
method.
In practice, it means that the __del__
can be considered as no-op.
Methods
__str__
__str__(self: _Self) -> String
Get the string representation of the type.
Returns:
String
: The string representation of the type.
Raises:
If there is an error when computing the string representation of the type.
Was this page helpful?
Thank you! We'll create more content like this.
Thank you for helping us improve!