jsonv::polymorphic_adapter< TPointer > Class Template Reference

An adapter which can create polymorphic types. More...

#include <jsonv/serialization_util.hpp>

Inheritance diagram for jsonv::polymorphic_adapter< TPointer >:

Public Types
using	match_predicate = std::function< bool(const extraction_context &, const value &)>

Public Member Functions
template<typename T >
void	add_subtype (match_predicate pred)
	Add a subtype which can be transformed into TPointer which will be called if the discriminator pred is matched. More...
template<typename T >
void	add_subtype_keyed (std::string key, value expected_value, keyed_subtype_action action=keyed_subtype_action::none)
	Add a subtype which can be transformed into TPointer which will be called if given a JSON value with kind::object which has a member with key and the provided expected_value. More...
void	check_null_input (bool on)
	When extracting a C++ value, should kind::null in JSON automatically become a default-constructed TPointer (which is usually the null representation)?
bool	check_null_input () const
void	check_null_output (bool on)
	When converting with to_json, should a null input translate into a kind::null?
bool	check_null_output () const
Public Member Functions inherited from jsonv::adapter_for< TPointer >
virtual const std::type_info &	get_type () const override
	Get the run-time type this extractor knows how to extract. More...
virtual void	extract (const extraction_context &context, const value &from, void *into) const override
	Extract a the type from a value into a region of memory. More...
virtual value	to_json (const serialization_context &context, const void *from) const override
	Create a value from the value in the given region of memory. More...

Protected Member Functions
virtual TPointer	create (const extraction_context &context, const value &from) const override
virtual value	to_json (const serialization_context &context, const TPointer &from) const override

Detailed Description

template<typename TPointer>
class jsonv::polymorphic_adapter< TPointer >

An adapter which can create polymorphic types.

This allows you to parse JSON directly into a type heirarchy without some middle layer.

[
  {
    "type": "worker",
    "name": "Adam"
  },
  {
    "type": "manager",
    "name": "Bob",
    "head": "Development"
  }
]

Template Parameters

TPointer

Some pointer-like type (likely unique_ptr or shared_ptr) you wish to extract values into. It must support operator*, an explicit conversion to bool, construction with a pointer to a subtype of what it contains and default construction.

Definition at line 559 of file serialization_util.hpp.

Member Function Documentation

template<typename TPointer>

template<typename T >

void jsonv::polymorphic_adapter< TPointer >::add_subtype ( match_predicate  pred )

inline

Add a subtype which can be transformed into TPointer which will be called if the discriminator pred is matched.

See also

add_subtype_keyed

Definition at line 574 of file serialization_util.hpp.

template<typename TPointer>

template<typename T >

void jsonv::polymorphic_adapter< TPointer >::add_subtype_keyed ( std::string  key, value  expected_value, keyed_subtype_action  action = keyed_subtype_action::none  )

inline

Add a subtype which can be transformed into TPointer which will be called if given a JSON value with kind::object which has a member with key and the provided expected_value.

See also

add_subtype

Definition at line 590 of file serialization_util.hpp.

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

• jsonv/serialization_util.hpp