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Mojo trait

ImplicitlyBoolable

The ImplicitlyBoolable trait describes a type that can be implicitly converted to a Bool.

Types conforming to this trait can be passed to a function that expects a Bool without explicitly converting to it. Accordingly, most types should conform to Boolable instead, since implicit conversions to Bool can have unintuitive consequences.

This trait requires the type to implement the __as_bool__() method. For example:

@value
struct Foo(ImplicitlyBoolable):
    var val: Bool

    fn __as_bool__(self) -> Bool:
        return self.val

    fn __bool__(self) -> Bool:
        return self.__as_bool__()
@value
struct Foo(ImplicitlyBoolable):
    var val: Bool

    fn __as_bool__(self) -> Bool:
        return self.val

    fn __bool__(self) -> Bool:
        return self.__as_bool__()

Implemented traits​

AnyType, Boolable, UnknownDestructibility

Methods​

__bool__​

__bool__(self: _Self) -> Bool

Get the boolean representation of the value.

Returns:

The boolean representation of the value.

__as_bool__​

__as_bool__(self: _Self) -> Bool

Get the boolean representation of the value.

Returns:

The boolean representation of the value.