JSON for Modern C++ 2.1.1

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
begin
begin
boolean_t
cbegin
cend
clear
const_iterator
const_pointer
const_reference
const_reverse_iterator
count
crbegin
crend
detail::external_constructor
diff
difference_type
dump
emplace
emplace_back
empty
end
end
erase
erase
erase
erase
exception
find
find
flatten
from_cbor
from_msgpack
front
front
get
get
get
get
get
get_allocator
get_ptr
get_ptr
get_ref
get_ref
insert
insert
insert
insert
insert
insert
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
iterator
iterator_wrapper
iterator_wrapper
json_serializer
max_size
meta
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=
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operator==
operator==
operator>
operator>
operator>
operator>=
operator>=
operator>=
operator>>
operator>>
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
other_error
out_of_range
parse
parse
parse
parse
parse
parse
parse_error
parse_event_t
parser_callback_t
patch
pointer
push_back
push_back
push_back
push_back
rbegin
rbegin
reference
rend
rend
reverse_iterator
size
size_type
string_t
swap
swap
swap
swap
to_cbor
to_msgpack
type
type_error
type_name
unflatten
value
value
value
value
value_t
value_type
~basic_json
| ## ◆ erase() [1/4] 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 | pos | ) |
| inline
  Removes the element specified by iterator pos. The iterator pos must be valid and dereferenceable. Thus the `end()` iterator (which is valid, but is not dereferenceable) cannot be used as a value for pos. If called on a primitive type other than `null`, the resulting JSON value will be `null`. Parameters
  [in] | pos | iterator to the element to remove
  Returns Iterator following the last removed element. If the iterator pos 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.202 | if called on an iterator which does not belong to the current JSON value; example: `"iterator does not fit current value"`
  invalid_iterator.205 | if called on a primitive type with invalid iterator (i.e., any iterator which is not `begin()`); example: `"iterator out of range"`
  Complexity The complexity depends on the type: objects: amortized constant arrays: linear in distance between pos and the 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 "json.hpp" 2 3 using json = nlohmann::json; 4 5 int main() 6 { 7 // create JSON values 8 json j_boolean = true; 9 json j_number_integer = 17; 10 json j_number_float = 23.42; 11 json j_object = {{"one", 1}, {"two", 2}}; 12 json j_array = {1, 2, 4, 8, 16}; 13 json j_string = "Hello, world"; 14 15 // call erase 16 j_boolean.erase(j_boolean.begin()); 17 j_number_integer.erase(j_number_integer.begin()); 18 j_number_float.erase(j_number_float.begin()); 19 j_object.erase(j_object.find("two")); 20 j_array.erase(j_array.begin() + 2); 21 j_string.erase(j_string.begin()); 22 23 // print values 24 std::cout << j_boolean << '\n'; 25 std::cout << j_number_integer << '\n'; 26 std::cout << j_number_float << '\n'; 27 std::cout << j_object << '\n'; 28 std::cout << j_array << '\n'; 29 std::cout << j_string << '\n'; 30 } nlohmann::json basic_json<> json default JSON class Definition: json.hpp:13933 Output (play with this example online):
      null
      null
      null
      {"one":1}
      [1,2,8,16]
      null
  The example code above can be translated with
      g++ -std=c++11 -Isrc doc/examples/erase__IteratorType.cpp -o erase__IteratorType
See also 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 erase(const size_type) – removes the element from an array at the given index Since version 1.0.0 Definition at line 4572 of file json.hpp.