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Calling C++ function on C main

Honky Yau

Hi,

I'm a beginner on MCU programming (STM32F4 discovery)

I'm building my code on C language. Recently, i find some library in C++ can achieved my job.
However, when i compile it, errors occurred.

"#20: identifier "namespace" is undefined _RWSTD_NAMESPACE_BEGIN (__rw)
"#65: expected a ";" ......

I think the issue comes from the compiler is C compiler which cannot compile C++ code.

How can i do with this case ?

Thank you.

  • 0

    You can either:
    1. change the extension of your file to .cpp - if it does not mix C and C++.
    2. Right click on the file name / logical folder to select the compiler to use.
    3. Only use C++ file extensions throughout the entire project.
    4. Use the preprocessor but I would not recommend that at all.

  • 0

    Not quite.

    The compiler can compile 'C' and C++

    www.keil.com/.../armcc_chr1359124192674.htm

    Usually, the compiler decides automatically from the filename extension:
    .c files will be compiled as 'C';
    .cpp files will be compiled as C++.

    Or you can force it explicitly by specifying options.

    In general, if you want to use any C++ code, it's usually easiest to make your whole project C++.

    In most cases, 'C' source code will "just work" when compiled as C++.

    "I'm a beginner on MCU programming"

    The above is entirely general - nothing specific to microcontrollers or Keil or ARM.

  • 0

    I think you need to Change the extension of your file to .cpp - if it does not mix C and C++.

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  • 0 in reply to manali kadam

    Use one of the following notations to declare that an object or function has the linkage of language language_name:

    extern “<i>language_name" declaration</i> ;

    extern “<i>language_name</i>“ { <i>declaration ; declaration </i>; ... }

    The first notation indicates that the declaration (or definition) that immediately follows has the linkage of language_name. The second notation indicates that everything between the curly braces has the linkage of language_name, unless declared otherwise. Notice that you do not use a semicolon after the closing curly brace in the second notation.

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