DataModel_detail::DVLCast< DVL, true > Struct Template Reference

casting operations for DataVector/List, dynamic_cast version. More...

#include <DVLCast.h>

Collaboration diagram for DataModel_detail::DVLCast< DVL, true >:

Public Types
typedef DVL::base_value_type	T

Static Public Member Functions
template<class U >
static int	find_offset (U *b)
	Find the offset of T within U. More...
template<class U >
static T *	cast (U *b)
	Cast b to a T*. More...
template<class U >
static const T *	cast (const U *b)
	Cast b to a const T*. More...

Detailed Description

template<class DVL>
struct DataModel_detail::DVLCast< DVL, true >

casting operations for DataVector/List, dynamic_cast version.

Definition at line 88 of file DVLCast.h.

Member Typedef Documentation

T

template<class DVL >

typedef DVL::base_value_type DataModel_detail::DVLCast< DVL, true >::T

Definition at line 90 of file DVLCast.h.

Member Function Documentation

cast() [1/2]

template<class DVL >

template<class U >

static const T* DataModel_detail::DVLCast< DVL, true >::cast ( const U *  b )

inlinestatic

Cast b to a const T*.

Parameters

b	Pointer to cast.

Definition at line 132 of file DVLCast.h.

  {
    // See above.
    if (!b)
      return 0;
    if (typeid(*b) == typeid(T)) {
      static ptrdiff_t offs = LONG_MAX;
      if (offs == LONG_MAX) {
        T* ret = dynamic_cast<const T*> (b);
        offs = reinterpret_cast<char*>(ret) - reinterpret_cast<char*>(b);
        return ret;
      }
      return reinterpret_cast<const T*> (reinterpret_cast<char*>(b) + offs);
    }
    else
      return dynamic_cast<const T*> (b);
  }

cast() [2/2]

template<class DVL >

template<class U >

static T* DataModel_detail::DVLCast< DVL, true >::cast ( U *  b )

inlinestatic

Cast b to a T*.

Parameters

b	Pointer to cast.

Definition at line 110 of file DVLCast.h.

  {
    // The common case will be for the dynamic type of b to be T.
    // So test to avoid a dynamic_cast in that case.
    // The extra test shouldn't add significant overhead
    // to the case where we really need to run dynamic_cast.
    if (!b)
      return 0;
    if (typeid(*b) == typeid(T)) {
      static const ptrdiff_t offs = find_offset (b);
      return reinterpret_cast<T*> (reinterpret_cast<char*>(b) + offs);
    }
    else
      return dynamic_cast<T*> (b);
  }

find_offset()

template<class DVL >

template<class U >

static int DataModel_detail::DVLCast< DVL, true >::find_offset ( U *  b )

inlinestatic

Find the offset of T within U.

Definition at line 97 of file DVLCast.h.

  {
    T* ret = dynamic_cast<T*> (b);
    int offs = reinterpret_cast<char*>(ret) - reinterpret_cast<char*>(b);
    return offs;
  }

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The documentation for this struct was generated from the following file:

• DVLCast.h