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https://github.com/NixOS/nix
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15658b259f
The short answer for why we need to do this is so we can consistently do
`#include "nix/..."`. Without this change, there are ways to still make
that work, but they are hacky, and they have downsides such as making it
harder to make sure headers from the wrong Nix library (e..g.
`libnixexpr` headers in `libnixutil`) aren't being used.
The C API alraedy used `nix_api_*`, so its headers are *not* put in
subdirectories accordingly.
Progress on #7876
We resisted doing this for a while because it would be annoying to not
have the header source file pairs close by / easy to change file
path/name from one to the other. But I am ameliorating that with
symlinks in the next commit.
(cherry picked from commit f3e1c47f47)
50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
#ifndef NIX_API_UTIL_INTERNAL_H
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#define NIX_API_UTIL_INTERNAL_H
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#include <string>
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#include <optional>
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#include "nix/error.hh"
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#include "nix_api_util.h"
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struct nix_c_context
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{
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nix_err last_err_code = NIX_OK;
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/** The last error message. Always check last_err_code. This may not have been cleared, so that clearing is fast. */
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std::optional<std::string> last_err = {};
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std::optional<nix::ErrorInfo> info = {};
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std::string name = "";
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};
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nix_err nix_context_error(nix_c_context * context);
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/**
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* Internal use only.
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*
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* Helper to invoke nix_get_string_callback
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* @param context optional, the context to store errors in if this function
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* fails
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* @param str The string to observe
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* @param callback Called with the observed string.
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* @param user_data optional, arbitrary data, passed to the callback when it's called.
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* @return NIX_OK if there were no errors.
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* @see nix_get_string_callback
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*/
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nix_err call_nix_get_string_callback(const std::string str, nix_get_string_callback callback, void * user_data);
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#define NIXC_CATCH_ERRS \
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catch (...) \
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{ \
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return nix_context_error(context); \
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} \
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return NIX_OK;
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#define NIXC_CATCH_ERRS_RES(def) \
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catch (...) \
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{ \
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nix_context_error(context); \
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return def; \
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}
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#define NIXC_CATCH_ERRS_NULL NIXC_CATCH_ERRS_RES(nullptr)
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#endif // NIX_API_UTIL_INTERNAL_H
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