llvm::json::ObjectMapper Class Reference

Helper for mapping JSON objects onto protocol structs. More...

#include "llvm/Support/JSON.h"

Public Member Functions
	ObjectMapper (const Value &E)
	operator bool ()
	True if the expression is an object. More...
template<typename T >
bool	map (StringRef Prop, T &Out)
	Maps a property to a field, if it exists. More...
template<typename T >
bool	map (StringRef Prop, llvm::Optional< T > &Out)
	Maps a property to a field, if it exists. More...

Detailed Description

Helper for mapping JSON objects onto protocol structs.

Example:

bool fromJSON(const Value &E, MyStruct &R) {
  ObjectMapper O(E);
  if (!O || !O.map("mandatory_field", R.MandatoryField))
    return false;
  O.map("optional_field", R.OptionalField);
  return true;
}

Definition at line 652 of file JSON.h.

Constructor & Destructor Documentation

ObjectMapper()

llvm::json::ObjectMapper::ObjectMapper ( const Value &  E )

inline

Definition at line 654 of file JSON.h.

Member Function Documentation

map() [1/2]

template<typename T >

bool llvm::json::ObjectMapper::map ( StringRef  Prop, T &  Out  )

inline

Maps a property to a field, if it exists.

Definition at line 661 of file JSON.h.

References assert(), E, llvm::json::fromJSON(), and llvm::RISCVFenceField::O.

map() [2/2]

template<typename T >

bool llvm::json::ObjectMapper::map ( StringRef  Prop, llvm::Optional< T > &  Out  )

inline

Maps a property to a field, if it exists.

(Optional requires special handling, because missing keys are OK).

Definition at line 670 of file JSON.h.

References assert(), E, llvm::json::fromJSON(), llvm::None, llvm::RISCVFenceField::O, and llvm::json::parse().

operator bool()

llvm::json::ObjectMapper::operator bool ( )

inline

True if the expression is an object.

Must be checked before calling map().

Definition at line 658 of file JSON.h.

References llvm::RISCVFenceField::O.

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

• include/llvm/Support/JSON.h