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Added BOOST_NO_CXX11_NON_PUBLIC_DEFAULTED_FUNCTIONS, BOOST_DEFAULTED_FUNCTION and BOOST_DELETED_FUNCTION macros for portable declaration of defaulted and deleted functions.

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[SVN r84798]
This commit is contained in:
Andrey Semashev
2013-06-15 17:34:04 +00:00
parent 75d100a4ac
commit 411399ec60
3 changed files with 90 additions and 0 deletions
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55
doc/macro_reference.qbk
View File

@ -751,6 +751,61 @@ with:
BOOST_STATIC_CONSTEXPR UIntType xor_mask = a;
``
]]
[[`BOOST_DEFAULTED_FUNCTION(fun, body)`][
This macro is intended to be used within a class definition in order to declare a default implementation of function `fun`.
For the compilers that do not support C++11 defaulted functions the macro will expand into an inline function definition
with the `body` implementation. For example:
``
struct my_struct
{
BOOST_DEFAULTED_FUNCTION(my_struct(), {})
};
``
is equivalent to:
``
struct my_struct
{
my_struct() = default;
};
``
or:
``
struct my_struct
{
my_struct() {}
};
``
]]
[[`BOOST_DELETED_FUNCTION(fun)`][
This macro is intended to be used within a class definition in order to declare a deleted function `fun`.
For the compilers that do not support C++11 deleted functions the macro will expand into a private function
declaration with no definition. Since the macro may change the access mode, it is recommended to use this macro
at the end of the class definition. For example:
``
struct noncopyable
{
BOOST_DELETED_FUNCTION(noncopyable(noncopyable const&))
BOOST_DELETED_FUNCTION(noncopyable& operator= (noncopyable const&))
};
``
is equivalent to:
``
struct noncopyable
{
noncopyable(noncopyable const&) = delete;
noncopyable& operator= (noncopyable const&) = delete;
};
``
or:
``
struct noncopyable
{
private:
noncopyable(noncopyable const&);
noncopyable& operator= (noncopyable const&);
};
``
]]
[[
``
BOOST_NOEXCEPT

5
include/boost/config/compiler/gcc.hpp
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@ -217,6 +217,11 @@
# define BOOST_NO_SFINAE_EXPR
#endif
// GCC 4.5 forbids declaration of defaulted functions in private or protected sections
#if !defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) && (__GNUC__ == 4 && __GNUC_MINOR__ <= 5)
# define BOOST_NO_CXX11_NON_PUBLIC_DEFAULTED_FUNCTIONS
#endif
// C++0x features in 4.5.0 and later
//
#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 5) || !defined(__GXX_EXPERIMENTAL_CXX0X__)

30
include/boost/config/suffix.hpp
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@ -689,6 +689,36 @@ namespace std{ using ::type_info; }
# define BOOST_ALIGNMENT(x)
#endif
// Defaulted and deleted function declaration helpers
// These macros are intended to be inside a class definition.
// BOOST_DEFAULTED_FUNCTION accepts the function declaration and its
// body, which will be used if the compiler doesn't support defaulted functions.
// BOOST_DELETED_FUNCTION only accepts the function declaration. It
// will expand to a private function declaration, if the compiler doesn't support
// deleted functions. Because of this it is recommended to use BOOST_DELETED_FUNCTION
// in the end of the class definition.
//
// class my_class
// {
// public:
// // Default-constructible
// BOOST_DEFAULTED_FUNCTION(my_class(), {})
// // Copying prohibited
// BOOST_DELETED_FUNCTION(my_class(my_class const&))
// BOOST_DELETED_FUNCTION(my_class& operator= (my_class const&))
// };
//
#if !(defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) || defined(BOOST_NO_CXX11_NON_PUBLIC_DEFAULTED_FUNCTIONS))
# define BOOST_DEFAULTED_FUNCTION(fun, body) fun = default;
#else
# define BOOST_DEFAULTED_FUNCTION(fun, body) fun body
#endif
#if !defined(BOOST_NO_CXX11_DELETED_FUNCTIONS)
# define BOOST_DELETED_FUNCTION(fun) fun = delete;
#else
# define BOOST_DELETED_FUNCTION(fun) private: fun;
#endif
//
// Set BOOST_NO_DECLTYPE_N3276 when BOOST_NO_DECLTYPE is defined