107 lines
2.7 KiB
C
107 lines
2.7 KiB
C
|
// Last update: June 20, 2001
|
||
|
|
|
||
|
|
#ifdef _MSC_VER
|
||
|
|
# pragma once
|
||
|
|
#else
|
||
|
|
# error "Visual C++ specific header !"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef VC_ALIGNMENT_INC_
|
||
|
|
#define VC_ALIGNMENT_INC_
|
||
|
|
|
||
|
|
#include "Typelist.h"
|
||
|
|
#include "static_check.h"
|
||
|
|
|
||
|
|
////////////////////////////////////////////////////////////////////////////////
|
||
|
|
// class template MaxAlign
|
||
|
|
// Computes the maximum alignof for all types in a typelist
|
||
|
|
// Usage: MaxAlign<TList>::result
|
||
|
|
////////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
template <class TList> struct VC_MaxAlign;
|
||
|
|
|
||
|
|
template <>
|
||
|
|
struct VC_MaxAlign< ::Loki::NullType >
|
||
|
|
{
|
||
|
|
enum { result = 0 };
|
||
|
|
};
|
||
|
|
|
||
|
|
template <class TList>
|
||
|
|
struct VC_MaxAlign
|
||
|
|
{
|
||
|
|
private:
|
||
|
|
ASSERT_TYPELIST(TList);
|
||
|
|
|
||
|
|
typedef typename TList::Head Head;
|
||
|
|
typedef typename TList::Tail Tail;
|
||
|
|
|
||
|
|
private:
|
||
|
|
enum { headResult = __alignof(Head) };
|
||
|
|
enum { tailResult = VC_MaxAlign<Tail>::result };
|
||
|
|
|
||
|
|
public:
|
||
|
|
enum { result = headResult > tailResult ?
|
||
|
|
headResult : tailResult };
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
////////////////////////////////////////////////////////////////////////////////
|
||
|
|
// class VC_AlignedPODBase
|
||
|
|
// Defines a host of protected types used by VC_AlignedPOD (defined later)
|
||
|
|
// Could be just part of VC_AlignedPOD itself, but making it separate ought to
|
||
|
|
// reduce compile times
|
||
|
|
////////////////////////////////////////////////////////////////////////////////
|
||
|
|
class VC_AlignedPODBase
|
||
|
|
{
|
||
|
|
protected:
|
||
|
|
|
||
|
|
template<unsigned AlignmentSize>
|
||
|
|
struct AlignedPod
|
||
|
|
{
|
||
|
|
STATIC_CHECK(AlignmentSize == 0, BadAlignmentSize_OnlyUpTo128);
|
||
|
|
};
|
||
|
|
|
||
|
|
//
|
||
|
|
// I used the macro because align(#)
|
||
|
|
// only works with Integer literals
|
||
|
|
//
|
||
|
|
#define ALIGNED_POD(_size_) \
|
||
|
|
template<> struct AlignedPod<_size_> { \
|
||
|
|
__declspec(align(_size_)) struct type { char X[_size_]; }; \
|
||
|
|
enum { alignment = __alignof(type) }; }; \
|
||
|
|
STATIC_CHECK((_size_ == sizeof(AlignedPod<_size_>::type)), SizeofNotEqualSize); \
|
||
|
|
STATIC_CHECK((_size_ == (AlignedPod<_size_>::alignment)), SizeofNotEqualAlignof)
|
||
|
|
|
||
|
|
|
||
|
|
ALIGNED_POD(1);
|
||
|
|
ALIGNED_POD(2);
|
||
|
|
ALIGNED_POD(4);
|
||
|
|
ALIGNED_POD(8);
|
||
|
|
ALIGNED_POD(16);
|
||
|
|
ALIGNED_POD(32);
|
||
|
|
ALIGNED_POD(64);
|
||
|
|
ALIGNED_POD(128);
|
||
|
|
// can be up to 8192 - is it realistic?
|
||
|
|
|
||
|
|
#undef ALIGNED_POD
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
////////////////////////////////////////////////////////////////////////////////
|
||
|
|
// class template VC_AlignedPOD
|
||
|
|
// Computes the alignment of all types in a typelist
|
||
|
|
////////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
template <typename TList>
|
||
|
|
class VC_AlignedPOD : VC_AlignedPODBase
|
||
|
|
{
|
||
|
|
enum { maxAlign = VC_MaxAlign<TList>::result };
|
||
|
|
|
||
|
|
public:
|
||
|
|
typedef typename AlignedPod<maxAlign>::type Result;
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif // VC_ALIGNMENT_INC_
|
||
|
|
|