template<template< typename, typename, typename... > class ObjectType = std::map, template< typename, typename... > class ArrayType = std::vector, class StringType = std::string, class BooleanType = bool, class NumberIntegerType = std::int64_t, class NumberUnsignedType = std::uint64_t, class NumberFloatType = double, template< typename > class AllocatorType = std::allocator, template< typename, typename=void > class JSONSerializer = adl_serializer>
Uses a JSON pointer to retrieve a reference to the respective JSON value. No bound checking is performed. Similar to operator[](const typename object_t::key_type&), null
values are created in arrays and objects if necessary.
In particular:
- If the JSON pointer points to an object key that does not exist, it is created an filled with a
null
value before a reference to it is returned.
- If the JSON pointer points to an array index that does not exist, it is created an filled with a
null
value before a reference to it is returned. All indices between the current maximum and the given index are also filled with null
.
- The special value
-
is treated as a synonym for the index past the end.
- Parameters
-
- Returns
- reference to the element pointed to by ptr
- Complexity Constant.
- Exceptions
-
parse_error.106 | if an array index begins with '0' |
parse_error.109 | if an array index was not a number |
out_of_range.404 | if the JSON pointer can not be resolved |
- Example The behavior is shown in the example. operatorjson_pointer.cpp Output (play with this example operatorjson_pointer.link): operatorjson_pointer.output The example code above can be translated withg++ -std=c++11 -Isrc doc/examples/operatorjson_pointer.cpp -o operatorjson_pointer
- Since
- version 2.0.0
Definition at line 13703 of file json.hpp.