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Learn how to correctly include C+ + header files while creating MEX files in MATLAB and resolve common issues that arise during compilation.
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How to Properly Include Header C+ + Files in MATLAB MEX Files

Are you trying to use C+ + code in your MATLAB environment but running into issues with including header files? If so, you're not alone. This is a common hurdle faced when integrating C+ + libraries, especially with specialized libraries like ALGLIB.

In this guide, we will explore the common problems that arise when including header files in MEX files and provide a step-by-step guide to correctly handle C+ + files within your MATLAB projects.

Understanding the Problem

When working with MATLAB MEX files, developers often encounter linker errors related to undefined references, particularly when they attempt to include C+ + header files incorrectly.

Common Errors

Undefined Reference Errors: These occur when the compiler cannot find the definitions for functions declared in header files. For example:

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Linking Issues with Libraries: This happens when trying to use functions from libraries like ALGLIB that require additional linking against those library files.

The Questions at Hand

Why does including a header file like Test.h lead to an error while using Test.cpp works?

Why can't the function from the ALGLIB library be recognized during compilation?

Solution to the Problem

To resolve these issues, follow these organized steps to ensure your MEX files compile successfully.

Step 1: Gather All Source Files

To avoid errors caused by missing references, ensure that you compile all C+ + source files (.cpp) that you may need:

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Step 2: Compile

Compile all files at once in MATLAB using the mex command:

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By doing this, you ensure that all the C+ + files are seen by the linker, preventing those pesky undefined reference errors.

Step 3: Include Only Header Files

Ensure you only include the header files in your C+ + source files. For instance, in cSpl_CPP.cpp, change:

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to

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This way, your MEX function will adhere to the standard practice of separating implementations (in .cpp files) from their declarations (in .h files).

Step 4: Remove Compilation Command Issues

If you're facing issues despite having all your files in the same directory, make sure to check your include paths and commands. Your command should be as follows:

[[See Video to Reveal this Text or Code Snippet]]

This command tells MATLAB where to find your header files, simplifying the inclusion process.

Conclusion

In summary, when integrating C+ + with MATLAB MEX files, correct inclusion of header files and compilation of all necessary source files are critical steps. By following these guidelines, you can avoid common errors and facilitate a smoother development experience.

If you follow these steps and best practices, compiling your MEX files will be much easier, and you'll be able to leverage powerful C+ + libraries like ALGLIB in your MATLAB environment with confidence.

Happy coding!