JSON for Modern C++  3.7.0

◆ erase() [4/4]

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>
void nlohmann::basic_json::erase ( const size_type  idx)
inline

Removes element from a JSON array at the index idx.

Parameters
[in]idxindex of the element to remove
Exceptions
type_error.307when called on a type other than JSON object; example: "cannot use erase() with null"
out_of_range.401when idx >= size(); example: "array index 17 is out of range"
Complexity
Linear in distance between idx and the end of the container.
Example
The example shows the effect of erase().
1 #include <iostream>
2 #include <nlohmann/json.hpp>
3 
4 using json = nlohmann::json;
5 
6 int main()
7 {
8  // create a JSON array
9  json j_array = {0, 1, 2, 3, 4, 5};
10 
11  // call erase
12  j_array.erase(2);
13 
14  // print values
15  std::cout << j_array << '\n';
16 }
basic_json<> json
default JSON class
Definition: json.hpp:2355

Output (play with this example online):
[0,1,3,4,5]
The example code above can be translated with
g++ -std=c++11 -Isingle_include doc/examples/erase__size_type.cpp -o erase__size_type 
See also
erase(IteratorType) – removes the element at a given position
erase(IteratorType, IteratorType) – removes the elements in the given range
erase(const typename object_t::key_type&) – removes the element from an object at the given key
Since
version 1.0.0

Definition at line 18293 of file json.hpp.