JSON for Modern C++ 3.7.1

accept
accept
allocator_type
array
array_t
at
at
at
at
at
at
back
back
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_iterator
const_pointer
const_reference
const_reverse_iterator
contains
contains
count
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detail::external_constructor
diff
difference_type
dump
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empty
end
end
erase
erase
erase
erase
error_handler_t
exception
find
find
flatten
from_bson
from_bson
from_cbor
from_cbor
from_msgpack
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from_ubjson
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front
front
get
get
get
get
get
get
get_allocator
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get_ref
get_ref
get_to
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initializer_list_t
input_format_t
insert
insert
insert
insert
insert
insert
insert_iterator
invalid_iterator
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
items
items
iterator
iterator_wrapper
iterator_wrapper
json_pointer
json_sax_t
json_serializer
max_size
merge_patch
meta
number_float_t
number_integer_t
number_unsigned_t
object
object_comparator_t
object_t
operator value_t
operator ValueType
operator!=
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operator<
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operator>
operator>
operator>=
operator>=
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operator>>
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operator[]
operator[]
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other_error
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parse
parse
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rbegin
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reference
rend
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reverse_iterator
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size
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swap
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swap
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to_bson
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to_bson
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to_msgpack
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to_ubjson
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type
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~basic_json
| ## ◆ erase() [3/4] 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> template<class IteratorType , typename std::enable_if< std::is_same< IteratorType, typename basic_json_t::iterator >::value or 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: linear in the length of the string 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 18308 of file json.hpp.

nlohmann::json
basic_json<> json
default JSON class
Definition: json.hpp:2445