morph::ui::author::ResultHandle< T > Class Template Reference

A mutation's result: a Handle with no field reads. More...

#include <author.hpp>

Inheritance diagram for morph::ui::author::ResultHandle< T >:

Public Member Functions
	ResultHandle (Handle< T > const &handle)
	The result read.
template<typename Class, typename Member>
Handle< Member >	at (Member Class::*member) const =delete
	Not available: bind the result with let first, auto r = screen.let("r", m.result());, then read r.at(...).
Handle< Any >	at (std::string_view field) const =delete
	Not available: bind the result with let first, auto r = screen.let("r", m.result());, then read r.at(...).
Public Member Functions inherited from morph::ui::author::Handle< T >
	Handle ()=default
	An absent handle.
bool	present () const noexcept
	Whether the handle holds an expression.
Json const &	json () const
	The expression's JSON.
Handle< Member >	at (Member Class::*member) const
	A field of the value, by member pointer: a renamed field is a compile error.
Handle	orElse (Handle const &fallback) const
	The value, or a fallback when it is null.

Additional Inherited Members
Public Types inherited from morph::ui::author::Handle< T >
using	ValueType
	The C++ type of the value.
Static Public Member Functions inherited from morph::ui::author::Handle< T >
static Handle	raw (Json json)
	A handle over an expression's JSON, for a form no builder spells.

Detailed Description

template<typename T>
class morph::ui::author::ResultHandle< T >

A mutation's result: a Handle with no field reads.

A result is not a named read, so a field of it cannot be read in place: the screen binds it first, auto r = screen.let("r", m.result());, and reads r.at(...). The at overloads are deleted, so the mistake is a compile error at the call rather than a refusal when the screen is registered. It converts to Handle<T> wherever a handle is taken.

Template Parameters

T	The result's C++ type.

Definition at line 1396 of file author.hpp.

Constructor & Destructor Documentation

ResultHandle()

template<typename T>

morph::ui::author::ResultHandle< T >::ResultHandle ( Handle< T > const & handle )

inlineexplicit

The result read.

Parameters

handle

The {"result": name} expression.

Definition at line 1400 of file author.hpp.

Member Function Documentation

at() [1/2]

template<typename T>

template<typename Class, typename Member>

Handle< Member > morph::ui::author::ResultHandle< T >::at ( Member Class::* member ) const

nodiscarddelete

Not available: bind the result with let first, auto r = screen.let("r", m.result());, then read r.at(...).

Template Parameters

Class	The class of the member.
Member	The member's type.

Parameters

member

The member.

Returns

Nothing; the overload is deleted.

at() [2/2]

template<typename T>

Handle< Any > morph::ui::author::ResultHandle< T >::at ( std::string_view field ) const

nodiscarddelete

Not available: bind the result with let first, auto r = screen.let("r", m.result());, then read r.at(...).

Parameters

field

The field.

Returns

Nothing; the overload is deleted.

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The documentation for this class was generated from the following file:

• morph/ui/author.hpp