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Bug 987253 - Add MOZ_EXPLICIT_CONVERSION - r=Waldo

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This commit is contained in:
Benoit Jacob 2014-04-25 22:34:04 -04:00
parent 48114cd838
commit 34e9d4b886
1 changed files with 32 additions and 0 deletions
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32
mfbt/Attributes.h
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@ -57,6 +57,9 @@
# if __has_extension(cxx_constexpr)
# define MOZ_HAVE_CXX11_CONSTEXPR
# endif
# if __has_extension(cxx_explicit_conversions)
# define MOZ_HAVE_EXPLICIT_CONVERSION
# endif
# if __has_extension(cxx_deleted_functions)
# define MOZ_HAVE_CXX11_DELETE
# endif
@ -79,6 +82,9 @@
# if MOZ_GCC_VERSION_AT_LEAST(4, 6, 0)
# define MOZ_HAVE_CXX11_CONSTEXPR
# endif
# if MOZ_GCC_VERSION_AT_LEAST(4, 5, 0)
# define MOZ_HAVE_EXPLICIT_CONVERSION
# endif
# define MOZ_HAVE_CXX11_DELETE
# else
/* __final is a non-C++11 GCC synonym for 'final', per GCC r176655. */
@ -101,6 +107,8 @@
# define MOZ_HAVE_CXX11_OVERRIDE
# define MOZ_HAVE_NEVER_INLINE __declspec(noinline)
# define MOZ_HAVE_NORETURN __declspec(noreturn)
// Staying away from explicit conversion operators in MSVC for now, see
// http://stackoverflow.com/questions/20498142/visual-studio-2013-explicit-keyword-bug
#endif
/*
@ -121,6 +129,30 @@
# define MOZ_CONSTEXPR_VAR const
#endif
/*
* MOZ_EXPLICIT_CONVERSION is a specifier on a type conversion
* overloaded operator that declares that a C++11 compiler should restrict
* this operator to allow only explicit type conversions, disallowing
* implicit conversions.
*
* Example:
*
* template<typename T>
* class Ptr
* {
* T* ptr;
* MOZ_EXPLICIT_CONVERSION operator bool() const {
* return ptr != nullptr;
* }
* };
*
*/
#ifdef MOZ_HAVE_EXPLICIT_CONVERSION
# define MOZ_EXPLICIT_CONVERSION explicit
#else
# define MOZ_EXPLICIT_CONVERSION /* no support */
#endif
/*
* MOZ_NEVER_INLINE is a macro which expands to tell the compiler that the
* method decorated with it must never be inlined, even if the compiler would