JSON for Modern C++ 2.1.1
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◆ operator[]() [2/10]

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>
const_reference nlohmann::basic_json< ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer >::operator[] ( const json_pointer ptr) const
inline

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]ptrJSON pointer to the desired element
Returns
const reference to the element pointed to by ptr
Complexity\n Constant.
Exceptions
std::out_of_rangeif the JSON pointer can not be resolved
std::domain_errorif an array index begins with '0'
std::invalid_argumentif an array index was not a number
Example\n The behavior is shown in the example. \n @includelineno operatorjson_pointer_const.cpp \n Output (play with this example @htmlinclude operatorjson_pointer_const.link):\n @verbinclude operatorjson_pointer_const.output \n The example code above can be translated with @verbatim g++ -std=c++11 -Isrc doc/examples/operatorjson_pointer_const.cpp -o operatorjson_pointer_const @endverbatim
Since
version 2.0.0

Definition at line 11768 of file json.hpp.