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|  How to Fix Error: 'make_unique' is not a member of 'std'

How to Fix Error: 'make_unique' is not a member of 'std'

October 14, 2024

Learn to resolve the C++ error 'make_unique' is not a member of 'std' with this step-by-step guide tailored for firmware developers using C++.

How to Fix Error: 'make_unique' is not a member of 'std'

 

Diagnose the Issue

  • The error message "'make\_unique' is not a member of 'std'" typically indicates that the version of C++ being used in your firmware project does not support the `make_unique` function. This function was introduced in C++14.
  • Check your project's compiler settings to see which C++ standard is being used. This can usually be found in your project's build configuration files or makefiles.

 

Update Compiler Settings

  • If your project is using an older standard, change it to at least C++14. For GCC or Clang, you can add the flag `-std=c++14` to your compiler options.
  • For CMake-based projects, you might want to add the following line to your CMakeLists.txt file: \`\`\`cpp set(CMAKE_CXX_STANDARD 14) \`\`\`
  • If you're using a different build system, refer to its documentation to find out how to specify the C++ standard.

 

Consider Compiler Compatibility

  • Ensure that your compiler version supports C++14. Versions of GCC 4.9 and above or Clang 3.4 and above are necessary for C++14 features.
  • Check the official websites of your compiler for documentation on C++14 support and download the latest version if needed.

 

Use Alternative Solutions

  • If upgrading your compiler or changing the project's C++ version is not feasible, you can manually replicate `make_unique` functionality: \`\`\`cpp template std::unique_ptr make_unique(Args&&... args) { return std::unique\_ptr(new T(std::forward(args)...)); } \`\`\` Add this template in a common header file that is included across your project files.
  • Using this, you can continue using `make_unique` in your code without altering the language standard.

 

Verify and Test

  • After making changes, ensure that your project builds successfully and run relevant tests to confirm that behavior has not regressed.
  • Consider creating additional tests that explicitly verify the intended use of `unique_ptr` to ensure proper functionality.

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