allocator_type array array_t at at at at back back basic_json basic_json basic_json basic_json basic_json basic_json basic_json basic_json basic_json basic_json basic_json basic_json basic_json basic_json basic_json basic_json basic_json basic_json basic_json basic_json basic_json basic_json basic_json begin begin boolean_t cbegin cend clear const_pointer const_reference const_reverse_iterator count crbegin crend difference_type dump empty end end erase erase erase erase find find front front get get get get_allocator get_ptr get_ptr get_ref get_ref insert insert insert insert insert is_array is_boolean is_discarded is_null is_number is_number_float is_number_integer is_number_unsigned is_object is_primitive is_string is_structured iterator_wrapper iterator_wrapper max_size number_float_t number_integer_t number_unsigned_t object object_t operator value_t operator ValueType operator!= operator!= operator!= operator+= operator+= operator+= operator< operator< operator<< operator<< operator<= operator= operator== operator== operator== operator> operator>= operator>> operator>> operator[] operator[] operator[] operator[] operator[] operator[] operator[] operator[] parse parse parse parse_event_t parser_callback_t pointer push_back push_back push_back rbegin rbegin reference rend rend reverse_iterator size size_type string_t swap swap swap swap type value value value_t value_type ~basic_json

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 = int64_t, class NumberUnsignedType = uint64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator> const_iterator nlohmann::basic_json< ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType >::cbegin ( ) const inline Returns a const iterator to the first element. Illustration from cppreference.com Returns const iterator to the first element Complexity Constant. Requirements This function satisfies the Container requirements: The complexity is constant. Has the semantics of const_cast<const basic_json&>(*this).begin(). Example The following code shows an example for cbegin. #include <json.hpp> using json = nlohmann::json; int main() { // create an array value const json array = {1, 2, 3, 4, 5}; // get am iterator to the first element json::const_iterator it = array.cbegin(); // serialize the element that the iterator points to std::cout << *it << '\n'; } Output (play with this example online): 1 The example code above can be translated with g++ -std=c++11 -Isrc doc/examples/cbegin.cpp -o cbegin Since version 1.0.0 Definition at line 4031 of file json.hpp.