Help me to understand strange 'typedef ... ' in some source... Post: 302983600

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Top Forums Programming Help me to understand strange 'typedef ... ' in some source... Post 302983600 by alex_5161 on Thursday 13th of October 2016 04:23:45 PM

10-13-2016

Registered User

Help me to understand strange 'typedef ... ' in some source...

Working on some source I've found some strange declaration in included header file.
I am looking for someone's help to understand me that syntax's, as it is fine (it is compiled without any complain,) but for me it seems out of any sense!
Acctually, it warning by CC compiler: " Warning: Implicit int is not supported in C++". That why I have checked that.

Code:

#ifdef WIN32 
typedef (_cdecl *COMPARE_ADDR)(void *,void*); 
#else 
extern "C" { 
typedef (*COMPARE_ADDR)(void *,void*); 
} 
#endif

I see it is preprared for diffrerent OS - Windows or Unix, but neither one 'typedef ..' I could understand

The 'typedef' should have [original_type] that will be reffered by the [user_defined_type].
So, it should be
typedef <initial_type> <new_name_for_initial_type>;

But here it seems as a casting or some function referencing syntax...
I could not understand what that means!

Could anyone give me a hint what that could be?

Thanks!

Last edited by alex_5161; 10-13-2016 at 05:34 PM..

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__gnu_cxx::throw_allocator_random

__gnu_cxx::throw_allocator_random< _Tp >(3cxx)							    __gnu_cxx::throw_allocator_random< _Tp >(3cxx)

NAME

       __gnu_cxx::throw_allocator_random< _Tp > -

SYNOPSIS

       Inherits __gnu_cxx::throw_allocator_base< _Tp, random_condition >.

   Public Types
       typedef const value_type * const_pointer
       typedef const value_type & const_reference
       typedef ptrdiff_t difference_type
       typedef value_type * pointer
       typedef value_type & reference
       typedef size_t size_type
       typedef _Tp value_type

   Public Member Functions
       throw_allocator_random (const throw_allocator_random &)	throw ()
       template<typename _Tp1 > throw_allocator_random (const throw_allocator_random< _Tp1 > &)  throw ()
       pointer address (reference __x) const
       const_pointer address (const_reference __x) const
       pointer allocate (size_type __n, std::allocator< void >::const_pointer hint=0)
       void check_allocated (void *p, size_t size)
       void check_allocated (pointer __p, size_type __n)
       void check_allocated (size_type __n)
       void construct (pointer __p, const value_type &val)
       void construct (pointer __p, _Args &&...__args)
       void deallocate (pointer __p, size_type __n)
       void destroy (pointer __p)
       void erase (void *p, size_t size)
       void insert (void *p, size_t size)
       size_type max_size () const  throw ()
       void seed (unsigned long __s)

   Static Public Member Functions
       static size_t get_label ()
       static void set_label (size_t l)
       static void set_probability (double __p)
       static void throw_conditionally ()

Detailed Description
   template<typename _Tp>struct __gnu_cxx::throw_allocator_random< _Tp >
       Allocator throwing via random condition.

       Definition at line 709 of file throw_allocator.h.

Author
       Generated automatically by Doxygen for libstdc++ from the source code.

libstdc++							  Tue Nov 27 2012		    __gnu_cxx::throw_allocator_random< _Tp >(3cxx)