Fuzion Logo
fuzion-lang.dev — The Fuzion Language Portal
JavaScript seems to be disabled. Functionality is limited.

Type

Type

§
 ref
:
Any
 is
 
[Private constructor]

Type -- parent feature of all type features

type features 'f.type' are declared implicitly for every feature f.
Type features do not contain state, they are unit types.

All type features inherit directly (Any.type) or indirectly (all
others type features) from this feature.

Type Functions

§
 => 
String  
[Redefinition of  Any.as_string]
string representation of this type to be used for debugging.

result has the form "Type of '<name>'", but this might change in the future

redefines:

§
 => 
Type  
[Redefinition of  Any.dynamic_type]
There is no dynamic type of a type instance since this would result in an
endless hierarchy of types, so dynamic_type is redefined to just return
Type.type here.

redefines:

Is this type assignable to a type parameter with constraint `T`?

The result of this is a compile-time constant that can be used to specialize
code for a particular type.

is_of_integer_type(n T : numeric) => T : integer
say (is_of_integer_type 1234) # true
say (is_of_integer_type 3.14) # false

it is most useful in conjunction preconditions or `if` statements as in

pair(a,b T) is

=>

or

val(n T) is

name of this type, including type parameters, e.g. 'option (list i32)'.
§
 => 
String  
[Redefinition of  Any.prefix $]
convenience prefix operator to create a string from a value.

This permits usage of `$` as a prefix operator in a similar way both
inside and outside of constant strings: $x and "$x" will produce the
same string.

NYI: Redefinition allows the type feature to be distinguished from its normal counterpart, see #3913

redefines:

§
 => 
Type  
[Inherited from  Any]
Get a type as a value.

This is a feature with the effect equivalent to Fuzion's `expr.type` call tail.
It is recommended to use `expr.type` and not `expr.type_value`.

`type_value` is here to show how this can be implemented and to illustrate the
difference to `dynamic_type`.