Unknown Type Name clang error when using NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE

[stoeckley]

What is the issue you have?

Clang reports:

error: unknown type name 's'

with this code:

struct Foo {
	string s;
};

NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(Foo, s)

(in the same namespace)

more specifically:

main.cpp:24:37: error: unknown type name 's'
NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(Foo, s)
                                            ^  (the '^' appears under the 's')
main.cpp:26:1: error: expected function body after function declarator

Compiled as so:

clang++ -std=c++17 main.cpp -o build/main -O3

~/projects/jsontest clang --version
Apple clang version 11.0.3 (clang-1103.0.32.62)
Target: x86_64-apple-darwin19.5.0
Thread model: posix

Which version of the library did you use?

3.8.0

• latest release version 3.7.3
• other release - please state the version: 3.8.0
• the develop branch

If you experience a compilation error: can you compile and run the unit tests?

• yes
• no - please copy/paste the error message below

[nlohmann]

Please try again with the latest develop branch. This issue should have been fixed lately.

The following code works with Apple clang version 12.0.0 (clang-1200.0.22.19).

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

using json = nlohmann::json;

struct Foo {
    std::string s;
};

NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(Foo, s)

int main()
{
    Foo foo;
    foo.s = "Hello, world!";
    
    json j = foo;
    std::cout << j << std::endl;
}

Output:

{"s":"Hello, world!"}

[stoeckley]

You are correct!! Thanks.