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~basic_json
| 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 = int64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator>
size_type nlohmann::basic_json::erase | ( | const typename object_t::key_type & | key | ) |
| inline
  Removes elements from a JSON object with the key value key. Parameters
  [in] | key | value of the elements to remove
  Returns Number of elements removed. If ObjectType is the default `std::map` type, the return value will always be `0` (key was not found) or `1` (key was found). Exceptions
  std::domain_error | when called on a type other than JSON object
  Complexity `log(size()) + count(key)` Example The example shows the effect of erase. 1 #include <json.hpp> 2 3 using namespace nlohmann; 4 5 int main() 6 { 7 // create a JSON object 8 json j_object = {{"one", 1}, {"two", 2}}; 9 10 // call erase 11 auto count_one = j_object.erase("one"); 12 auto count_three = j_object.erase("three"); 13 14 // print values 15 std::cout << j_object << '\n'; 16 std::cout << count_one << " " << count_three << '\n'; 17 } nlohmann::basic_json a class to store JSON values Definition: json.hpp:121 nlohmann namespace for Niels Lohmann Definition: json.hpp:56 nlohmann::basic_json::erase InteratorType erase(InteratorType pos) remove element given an iterator Definition: json.hpp:2498 Output:
      {"two":2}
      1 0
  The example code above can be translated with
      g++ -std=c++11 -Isrc doc/examples/erase__key_type.cpp -o erase__key_type
.