Was hoping for something that would be C++03 compatible as well since we still have C++03 compilers to target as well.
From: don hinton <hinto...@gmail.com<mailto:hinto...@gmail.com>> Date: Monday, February 29, 2016 at 10:38 AM To: Brian L Cole <co...@eyesopen.com<mailto:co...@eyesopen.com>> Cc: "cfe-users@lists.llvm.org<mailto:cfe-users@lists.llvm.org>" <cfe-users@lists.llvm.org<mailto:cfe-users@lists.llvm.org>> Subject: Re: [cfe-users] Anyway to prevent this code from compiling? Try using initialization list syntax. That way the parser won't think you are declaring a function. OELock lock{mutex}; On Mon, Feb 29, 2016 at 12:02 PM, Brian Cole via cfe-users <cfe-users@lists.llvm.org<mailto:cfe-users@lists.llvm.org>> wrote: Since switching over to clang C++11 on OS X, we had this weird C++ oddity surface while writing some new code. The problem is that ‘mutex’ is no longer a variable, it is a class type that can be interpreted as a function argument. That is, the following line of code can be interpreted as a function declaration now: OELock lock(mutex); Instead of a scoped lock acquisition as has been convention for some time now. The full code to recreate the subtle bug is as follows: #include <mutex> using namespace std; struct OEMutex { void Acquire() {} void Release() {} }; static OEMutex _mutex; class OELock { OEMutex &_mutex; OELock(); OELock(const OELock&); OELock& operator=(const OELock&); public: OELock(OEMutex &mutex) : _mutex(mutex) { _mutex.Acquire(); } ~OELock() { _mutex.Release(); } }; int main() { OELock lock(mutex); } Ideally, we would like the compilation to fail and tell the user the ‘mutex’ variable can not be found. Any clever C++ trick to do that? We’ve tried declaring the move constructors of OELock to be private, but it still compiles (maybe that’s SFINAE?). Thanks, Brian _______________________________________________ cfe-users mailing list cfe-users@lists.llvm.org<mailto:cfe-users@lists.llvm.org> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-users
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