template<template< typename U, typename V, typename... Args > class ObjectType = std::map, template< typename U, typename... Args > 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 U > class AllocatorType = std::allocator, template< typename T, typename SFINAE=void > class JSONSerializer = adl_serializer>
Uses a JSON pointer to retrieve a reference to the respective JSON value. No bound checking is performed. The function does not change the JSON value; no null
values are created. In particular, the the special value -
yields an exception.
- Parameters
-
[in] | ptr | JSON pointer to the desired element |
- Returns
- const 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.402 | if the array index '-' is used |
out_of_range.404 | if the JSON pointer can not be resolved |
- Example^^ The behavior is shown in the example. ^^ operatorjson_pointer_const.cpp
- Output (play with this example online):^^
1
"foo"
[1,2]
2
^^ The example code above can be translated withg++ -std=c++11 -Isingle_include doc/examples/operatorjson_pointer_const.cpp -o operatorjson_pointer_const
- Since
- version 2.0.0
Definition at line 19587 of file json.hpp.