locale_classic.cpp

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#define _RWSTD_LIB_SRC
#include <rw/_defs.h>
 
#include <new>             // for placment new
 
#include <loc/_locale.h>   // for locale
#include "once.h"          // for __rw_once()
 
 
_RWSTD_NAMESPACE (__rw) { 
 
// static buffer for the classic "C" locale object
static union {
    void* _C_align;
    char  _C_buf [sizeof (_STD::locale)];
} __rw_classic;
 
 
// init-once flag for the classic "C" locale object
static __rw_once_t
__rw_classic_once_init = _RWSTD_ONCE_INIT;
 
 
extern "C" {
 
// one-time initializer for the classic "C" locale object
static void
__rw_init_classic ()
{
#ifdef _RWSTDDEBUG
 
    static int init;
 
    // paranoid check: verify that one-time initialization works
    _RWSTD_ASSERT (0 == init);
 
    ++init;
 
#endif   // _RWSTDDEBUG
 
    // construct the classic "C" locale in the provided buffer
    new (&__rw_classic) _STD::locale ("C");
}
 
}   // extern "C"
 
}   // namespace __rw
 
 
_RWSTD_NAMESPACE (std) {
 
 
/* static */ const locale& locale::
classic ()
{
    // initialize classic locale in the static buffer exactly once
    _RW::__rw_once (&_RW::__rw_classic_once_init, _RW::__rw_init_classic);
 
    // cast the address of the buffer to a locale pointer
    const locale* const pclassic =
        _RWSTD_REINTERPRET_CAST (locale*, &_RW::__rw_classic);
 
    _RWSTD_ASSERT (0 != pclassic->_C_body);
 
    return *pclassic;
}
 
 
}   // namespace std