JSON for Modern C++ 3.8.0

accept
accept
accept
allocator_type
array
array_t
at
at
at
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at
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back
back
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
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begin
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binary
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erase
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find
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~basic_json
| ## ◆ erase() [3/4] template<class IteratorType , typename std::enable_if< std::is_same< IteratorType, typename basic_json_t::iterator >::value||std::is_same< IteratorType, typename basic_json_t::const_iterator >::value, int >::type = 0>
IteratorType nlohmann::basic_json::erase | ( | IteratorType | first,
|  | IteratorType | last
| ) |  |
| inline
  Removes the element specified by the range `[first; last)`. The iterator first does not need to be dereferenceable if `first == last`: erasing an empty range is a no-op. If called on a primitive type other than `null`, the resulting JSON value will be `null`. Parameters
  [in] | first | iterator to the beginning of the range to remove
  [in] | last | iterator past the end of the range to remove
  Returns Iterator following the last removed element. If the iterator second refers to the last element, the `end()` iterator is returned. Template Parameters
  IteratorType | an iterator or const_iterator
  Postcondition Invalidates iterators and references at or after the point of the erase, including the `end()` iterator. Exceptions
  type_error.307 | if called on a `null` value; example: `"cannot use erase() with null"`
  invalid_iterator.203 | if called on iterators which does not belong to the current JSON value; example: `"iterators do not fit current value"`
  invalid_iterator.204 | if called on a primitive type with invalid iterators (i.e., if `first != begin()` and `last != end()`); example: `"iterators out of range"`
  Complexity The complexity depends on the type: objects: `log(size()) + std::distance(first, last)` arrays: linear in the distance between first and last, plus linear in the distance between last and end of the container strings and binary: linear in the length of the member other types: constant Example The example shows the result of `erase()` for different JSON types. 1 #include <iostream> 2 #include <nlohmann/json.hpp> 3 4 using json = nlohmann::json; 5 6 int main() 7 { 8 // create JSON values 9 json j_boolean = true; 10 json j_number_integer = 17; 11 json j_number_float = 23.42; 12 json j_object = {{"one", 1}, {"two", 2}}; 13 json j_array = {1, 2, 4, 8, 16}; 14 json j_string = "Hello, world"; 15 16 // call erase() 17 j_boolean.erase(j_boolean.begin(), j_boolean.end()); 18 j_number_integer.erase(j_number_integer.begin(), j_number_integer.end()); 19 j_number_float.erase(j_number_float.begin(), j_number_float.end()); 20 j_object.erase(j_object.find("two"), j_object.end()); 21 j_array.erase(j_array.begin() + 1, j_array.begin() + 3); 22 j_string.erase(j_string.begin(), j_string.end()); 23 24 // print values 25 std::cout << j_boolean << '\n'; 26 std::cout << j_number_integer << '\n'; 27 std::cout << j_number_float << '\n'; 28 std::cout << j_object << '\n'; 29 std::cout << j_array << '\n'; 30 std::cout << j_string << '\n'; 31 } Output (play with this example online):
      null
      null
      null
      {"one":1}
      [1,8,16]
      null
  The example code above can be translated with
      g++ -std=c++11 -Isingle_include doc/examples/erase__IteratorType_IteratorType.cpp -o erase__IteratorType_IteratorType
See also erase(IteratorType) – removes the element at a given position erase(const typename object_t::key_type&) – removes the element from an object at the given key erase(const size_type) – removes the element from an array at the given index Since version 1.0.0 Definition at line 20539 of file json.hpp.

nlohmann::json
basic_json<> json
default JSON class
Definition: json.hpp:2933