JSON for Modern C++  2.0.3

§ insert() [2/5]

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>
iterator nlohmann::basic_json::insert ( const_iterator  pos,
basic_json &&  val 
)
inline

inserts element Inserts element val before iterator pos.

Parameters
[in]positerator before which the content will be inserted; may be the end() iterator
[in]valelement to insert
Returns
iterator pointing to the inserted val.
Exceptions
std::domain_errorif called on JSON values other than arrays; example: "cannot use insert() with string"
std::domain_errorif pos is not an iterator of *this; example: "iterator does not fit current value"
Complexity
Constant plus linear in the distance between pos and end of the container.
Example
The example shows how insert() is used.
1 #include <json.hpp>
2 
3 using json = nlohmann::json;
4 
5 int main()
6 {
7  // create a JSON array
8  json v = {1, 2, 3, 4};
9 
10  // insert number 10 before number 3
11  auto new_pos = v.insert(v.begin() + 2, 10);
12 
13  // output new array and result of insert call
14  std::cout << *new_pos << '\n';
15  std::cout << v << '\n';
16 }
basic_json<> json
default JSON class
Definition: json.hpp:10122
Output (play with this example online):
10
[1,2,10,3,4]
The example code above can be translated with
g++ -std=c++11 -Isrc doc/examples/insert.cpp -o insert 
Since
version 1.0.0

Definition at line 5100 of file json.hpp.