Latest version 3.9.1 uses throw instead of JSON_THROW in the amalgamated json.hpp file

[xykivo]

What is the issue you have?

In the 3.9.1 release, the amalgamated header (json.hpp), contains 2 throw statements

• Line 16454
• Line 16467

This causes compilation with the -fno-exceptions flag to fail.
Replacing these throw calls with JSON_THROW solves the issue.

I tried to fix the issue and create a pull request. However I couldn't find where these 2 lines are generated in the source code.

Please describe the steps to reproduce the issue.

1. Include json.hpp in a C++ source file (simple main that includes the header, and create a json instance is enough)
2. Compile the source file (using gcc or clang) with -fno-exceptions
   3 Compilation fails because of the throw statements
3. Replace throw statements with JSON_THROW
4. Compilation passes

Can you provide a small but working code example?

See above

What is the expected behavior?

Compiling with -fno-exceptions should pass

And what is the actual behavior instead?

Compilation with -fno-exceptions fails

Which compiler and operating system are you using?

• Operating system: Ubuntu 20.04
• Compiler: clang 10.0.0
• Compiler: gcc 9.3.0

Which version of the library did you use?

3.9.1

• [x ] latest release version 3.9.1
• other release - please state the version: ___
• the develop branch

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

Did not check unit tests.

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

[nlohmann]

This has been fixed in the develop branch.

[nlohmann]

Duplicate of #2725.