☰
handles2
handles2
Functions
replace effect in the current context by this and abort current execution
does this effect support abort?
Redefining this to return `false` helps to detect unexptected calls to
`abort` at runtime and ensure that the static analysis finds that the
code executed with this effect will always return normally and produce
a result. This is used, e.g, in `mutate` to avoid static analysis
reporting `panic` as an effect of the use of a local mutate instance.
Redefining this to return `false` helps to detect unexptected calls to
`abort` at runtime and ensure that the static analysis finds that the
code executed with this effect will always return normally and produce
a result. This is used, e.g, in `mutate` to avoid static analysis
reporting `panic` as an effect of the use of a local mutate instance.
create a String from this instance. Unless redefined, `a.as_string` will
create `"instance[T]"` where `T` is the dynamic type of `a`
create `"instance[T]"` where `T` is the dynamic type of `a`
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 hierachy of types. So for Type values, dynamic_type is redefined
to just return Type.type.
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 hierachy of types. So for Type values, dynamic_type is redefined
to just return Type.type.
get the value referred to by a given handle
§(B type, MB type, f Unary (monad.infix >>=~.MB) monad.A):Any => monad.infix >>=~.MB [Inherited from monad]
§(B
type
, MB type
, f Unary (monad.infix >>=~.MB) monad.A):
Any =>
monad.infix >>=~.MB [Inherited from monad]
monadic operator to another monad
Apply f to elements of type A and wrap them in MB.
NYI: This is currently useless since a redefinition is not
allowed for features with generic arguments. Is there a way
we could allow this anyway?
Apply f to elements of type A and wrap them in MB.
NYI: This is currently useless since a redefinition is not
allowed for features with generic arguments. Is there a way
we could allow this anyway?
join operator
NYI: useless since redefinition currently not supported for
feature with generics.
NYI: useless since redefinition currently not supported for
feature with generics.
return the last handle that was created by 'new'
name of this type, including type parameters, e.g. 'option (list i32)'.
create a new instance with one additional handle
the new handle can be accessed by 'result.last'
the new handle can be accessed by 'result.last'
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.
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.
create a new instance with new value referred to by a given handle
abort the current execution and return from the surrounding call to
abortable with result == false.
abortable with result == false.
§(R type, f Function effect.run.R, def Function effect.run.R):Any => effect.run.R [Inherited from effect]
§(R
type
, f Function effect.run.R, def Function effect.run.R):
Any =>
effect.run.R [Inherited from effect]
execute the code of 'f' in the context of this effect
create a new instance with the value referred to by a given handle read and
updated.
updated.
Type Features
has an effect of the given type been installed?
has an effect of the given type been installed?
return function
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`.
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`.
cells.
handles is a state monad. It provides features to create several
handles that refer to modifiable value and features to 'get', 'put' or
'update' this value.
For performance, this implementation uses mutable state. It can consequently
only be used as a one-way monad.