// CLASS METHODS
void my_Singleton::initSingleton(const char *id,
bslma::Allocator *basicAllocator)
{
static bsls::AlignedBuffer<sizeof(my_Singleton)> singleton;
d_singleton_p = new (singleton.buffer()) my_Singleton(id,
basicAllocator);
}
enum { VERBOSE_ARG_NUM = 2, VERY_VERBOSE_ARG_NUM, VERY_VERY_VERBOSE_ARG_NUM };
//=============================================================================
// USAGE EXAMPLES
//-----------------------------------------------------------------------------
// The 'allocateFromBuffer' function below uses an aligned buffer as a small
// heap from which objects can be allocated. We choose 'int' alignment
// (4-byte alignment) for our buffer because the objects we are allocating
// are composed of 'char', 'short', and 'int' values only. If no alignment
// were specified, the buffer would be maximally aligned, which could be
// wasteful on some platforms.
//..
const int MY_ALIGNMENT = bsls::AlignmentFromType<int>::VALUE;
bsls::AlignedBuffer<1000, MY_ALIGNMENT> my_AllocBuffer;
const char* my_AllocEnd = my_AllocBuffer.buffer() + 1000;
char *my_AllocPtr = my_AllocBuffer.buffer();
// Invariant: my_AllocPtr is always aligned on a multiple of 4 bytes
static void *allocateFromBuffer(int size)
{
if (size > my_AllocEnd - my_AllocPtr)
return 0; // Out of buffer space // RETURN
void *result = my_AllocPtr;
my_AllocPtr += size;
if (size % MY_ALIGNMENT) {
// re-establish invariant by re-aligning my_AllocPtr
my_AllocPtr += MY_ALIGNMENT - size % MY_ALIGNMENT;
}