Mojo trait
Copyable
The Copyable trait denotes a type whose value can be copied.
Example implementing the Copyable trait on Foo which requires the __copyinit__
method:
struct Foo(Copyable):
var s: String
@implicit
fn __init__(out self, s: String):
self.s = s
fn __copyinit__(out self, other: Self):
print("copying value")
self.s = other.s
struct Foo(Copyable):
var s: String
@implicit
fn __init__(out self, s: String):
self.s = s
fn __copyinit__(out self, other: Self):
print("copying value")
self.s = other.s
You can now copy objects inside a generic function:
fn copy_return[T: Copyable](foo: T) -> T:
var copy = foo
return copy
var foo = Foo("test")
var res = copy_return(foo)
fn copy_return[T: Copyable](foo: T) -> T:
var copy = foo
return copy
var foo = Foo("test")
var res = copy_return(foo)
copying value
copying value
Implemented traits
AnyType,
UnknownDestructibility
Methods
__copyinit__
__copyinit__(out self: _Self, existing: _Self, /)
Create a new instance of the value by copying an existing one.
Args:
- existing (
_Self): The value to copy.
Returns:
_Self
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