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bool

bool

bool -- Standard Fuzion type 'bool'

We need to apologize to George Boole for crippling his name a bit,
just to safe us from typing one more letter. But at least we stop
here and do not use boo, bo or similar.

bool is a choice type that can either be TRUE of FALSE.

Note that 'TRUE' and 'FALSE' themselves are not of type 'bool'.
Routines 'true' and 'false' are the preferred way to get a constant
value of type 'bool'.

Functions

create an option from a lazily evaluated value depending on this bool
§
:
Any
 => 
String 
[Redefinition of Any.as_string]
human readable string

redefines:

§
:
Any
 => 
Type 
[Inherited from  Any]
Get the dynamic type of this instance. For value instances `x`, this is
equal to `type_of x`, but for `x` with a `ref` type `x.dynamic_type` gives
the actual runtime type, while `type_of x` results in the static
compile-time type.

There is no dynamic type of a type instance since this would result in an
endless hierarchy of types. So for Type values, dynamic_type is redefined
to just return Type.type.
and
and with lazy evaluation
implies
equivalence

note that we do not use '==' for this to avoid confusion since
a == b == c for booleans might not behave as expected
('true <=> false <=> false' evaluates to 'true')
xor
or
or with lazy evaluation
not
§
:
Any
 => 
String 
[Inherited from  Any]
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.
§(T 
type
, a bool.ternary ? :.T, b bool.ternary ? :.T)
:
Any
 => 
bool.ternary ? :.T
ternary ? : -- NYI: This will be replaced by a more powerful match syntax
NYI: #1726, #2301: a and b should be marked Lazy here

Type Features

monoid of bool with infix & operation. Will be true iff all elements are
true.
monoid of bool with infix | operation. Will be false iff all elements are
false.
§
:
Any
 is
 
[Inherited from  Type]
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:

§
:
Any
 is
 
[Inherited from  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:

equality check implementation for inherited property.equatable
§(T 
type
)
:
Any
 is
 
[Inherited from  Type]
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

§
:
Any
 is
 
[Inherited from  Type]
name of this type, including type parameters, e.g. 'option (list i32)'.
monoid of bool with infix ^ operation. Will be true iff an odd number of
elements is true. This gives the even parity.
§
:
Any
 is
 
[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`.
last changed: 2024-09-18