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Asked: 2026-05-14T07:32:51+00:00

I’m trying to use the OpenCA (libPKI) library in a C++ application. However, when

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I’m trying to use the OpenCA (libPKI) library in a C++ application. However, when including the file pki_x509_data_st.h the following code fragment is encountered:

typedef struct pki_x509_callbacks_st {

 /* ---------------- Memory Management -------------------- */
 void * (*new)  (void    );
 void   (*free) (void *x );
 void * (*dup)  (void *x );

This won’t compile because of the “new” pointer declaration.

How can I make it work?

Update
After renaming the “new” variable I’ve encountered some new problems (“using typedef name after struct” etc.. ). I want to avoid changing too much of the old C code (modifying library headers somehow makes me feel nervous) so I decided just create a minimal isolation layer instead.

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1 Answer

  1. Editorial Team

    If you can get away with it, rename it to something that’s not a reserved word in C++. Chances that that you might end up having to rebuild the whole library and apply your “fix” there as well.

    I’d be looking into constructing an isolation layer between your C++ code and the C library, potentially a bit of C code that only exposes the functions you need to use and completely isolate you from the rest.

    Oh, and by the way – that’s a function pointer declaration, not a variable declaration. Just to clear this up…

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