Compilation error occurs when using nlohmann::ordered_map

[wangbw1116]

Description

When I use macro 'NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT' to transfer ordered_json to class, the class contains a nlohmann::ordered_map, compile error

Reproduction steps

#include <iostream>
#include <nlohmann/json.hpp>

using namespace std;
using nlohmann::ordered_json;
using nlohmann::ordered_map;

struct J_Data {
    float b = 2;
    ordered_map<string, string> c;
    int a = 1;
    NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT(J_Data, b, c, a)
};

int main() {
    J_Data data1;
    ordered_json j = data1;
    cout << "j: " << j << endl;

    J_Data data2 = j;
    cout << "j: " << j << endl;
    return 0;
}

compiler error:
/usr/include/c++/10/bits/stl_algobase.h:380:18: error: use of deleted function ‘std::pair<const std::__cxx11::basic_string, std::__cxx11::basic_string >& std::pair<const std::__cxx11::basic_string, std::__cxx11::basic_string >::operator=(const std::pair<const std::__cxx11::basic_string, std::__cxx11::basic_string >&)’
380 | *__result = *__first;

Expected vs. actual results

fix the bug

Minimal code example

Error messages

Compiler and operating system

ubuntu20

Library version

gcc version 10.5.0

Validation

• The bug also occurs if the latest version from the develop branch is used.
• I can successfully compile and run the unit tests.