lix/src/libutil/variant-wrapper.hh
Jade Lovelace 0cc285f87b
treewide: fix a bunch of lints
Fixes:
- Identifiers starting with _ are prohibited
- Some driveby header dependency cleaning which wound up with doing some
  extra fixups.
- Fucking C style casts, man. C++ made these 1000% worse by letting you
  also do memory corruption with them with references.
  - Remove casts to Expr * where ExprBlackHole is an incomplete type by
    introducing an explicitly-cast eBlackHoleAddr as Expr *.
  - An incredibly illegal cast of the text bytes of the StorePath hash
    into a size_t directly. You can't DO THAT.

    Replaced with actually parsing the hash so we get 100% of the bits
    being entropy, then memcpying the start of the hash. If this shows
    up in a profile we should just make the hash parser faster with a
    lookup table or something sensible like that.
  - This horrendous bit of UB which I thankfully slapped a deprecation
    warning on, built, and it didn't trigger anywhere so it was dead
    code and I just deleted it. But holy crap you *cannot* do that.

    inline void mkString(const Symbol & s)
    {
        mkString(((const std::string &) s).c_str());
    }
- Some wrong lints. Lots of wrong macro lints, one wrong
  suspicious-sizeof lint triggered by the template being instantiated
  with only pointers, but the calculation being correct for both
  pointers and not-pointers.
- Exceptions in destructors strike again. I tried to catch the
  exceptions that might actually happen rather than all the exceptions
  imaginable. We can let the runtime hard-kill it on other exceptions
  imo.

Change-Id: I71761620846cba64d66ee7ca231b20c061e69710
2024-08-26 16:13:03 -07:00

32 lines
943 B
C++

#pragma once
///@file
// not used, but will be used by callers
#include <variant>
/**
* Force the default versions of all constructors (copy, move, copy
* assignment).
*/
// NOLINTBEGIN(bugprone-macro-parentheses)
#define FORCE_DEFAULT_CONSTRUCTORS(CLASS_NAME) \
CLASS_NAME(const CLASS_NAME &) = default; \
CLASS_NAME(CLASS_NAME &) = default; \
CLASS_NAME(CLASS_NAME &&) = default; \
\
CLASS_NAME & operator =(const CLASS_NAME &) = default; \
CLASS_NAME & operator =(CLASS_NAME &) = default;
// NOLINTEND(bugprone-macro-parentheses)
/**
* Make a wrapper constructor. All args are forwarded to the
* construction of the "raw" field. (Which we assume is the only one.)
*
* The moral equivalent of `using Raw::Raw;`
*/
#define MAKE_WRAPPER_CONSTRUCTOR(CLASS_NAME) \
FORCE_DEFAULT_CONSTRUCTORS(CLASS_NAME) \
\
CLASS_NAME(auto &&... arg) \
: raw(std::forward<decltype(arg)>(arg)...) \
{ }