jsonv::value_adapter_for< T > Class Template Reference

A base for adapters written against the older value -based extraction interface. More...

#include <jsonv/serialization/adapter_for.hpp>

Inheritance diagram for jsonv::value_adapter_for< T >:

Collaboration diagram for jsonv::value_adapter_for< T >:

Protected Member Functions
virtual std::expected< T, ast_node_type >	create (extraction_context &context, reader &from) const final override
	Create an instance of T by reading from.
virtual T	create (extraction_context &context, const value &from) const =0
	Create an instance of T from the materialised from.
Protected Member Functions inherited from jsonv::adapter_for< T >
virtual value	to_json (const serialization_context &context, const T &from) const =0

Additional Inherited Members
Public Member Functions inherited from jsonv::adapter_for< T >
virtual const std::type_info &	get_type () const noexcept override
virtual std::expected< void, ast_node_type >	extract (extraction_context &context, reader &from, void *into) const override
virtual value	to_json (const serialization_context &context, const void *from) const override

Detailed Description

template<typename T>
class jsonv::value_adapter_for< T >

A base for adapters written against the older value -based extraction interface.

The subtree under the reader is materialised with read_value and handed to the subclass, whose create runs unchanged. This costs the whole subtree in memory, which is exactly what extracting off a reader is meant to avoid – so it is a stepping stone for ports, not a destination. New adapters should derive from adapter_for and walk the reader.

Definition at line 95 of file adapter_for.hpp.

Member Function Documentation

create() [1/2]

template<typename T >

virtual T jsonv::value_adapter_for< T >::create ( extraction_context &  context, const value &  from  ) const

protectedpure virtual

Create an instance of T from the materialised from.

Exceptions

extraction_error

if from cannot be converted to a T.

Implemented in jsonv::container_adapter< TContainer >, jsonv::enum_adapter< TEnum, FEnumComp, FValueComp >, jsonv::optional_adapter< TOptional >, jsonv::polymorphic_adapter< TPointer >, and jsonv::wrapper_adapter< TWrapper >.

create() [2/2]

template<typename T >

virtual std::expected< T, ast_node_type > jsonv::value_adapter_for< T >::create ( extraction_context &  context, reader &  from  ) const

inlinefinaloverrideprotectedvirtual

Create an instance of T by reading from.

Parameters

context	Extra information to help you decode sub-objects, such as looking up other extractor implementations via formats. Record any problem you encounter with extraction_context::problem.
from	The JSON reader to extract from. On a successful return it should sit one position past the value which was read, as reader::next_value would have left it.

Returns

The created instance; otherwise a std::unexpected carrying the ast_node_type actually found when the failure was a type mismatch, or ast_node_type::error otherwise.

Implements jsonv::adapter_for< T >.

Definition at line 101 of file adapter_for.hpp.

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

• jsonv/serialization/adapter_for.hpp