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Changed code to use the new DLIB_ASSERT_HAS_STANDARD_LAYOUT to check 

if a type can be swapped rather than the explicit union trick.
This commit is contained in:
Davis King 2011-05-28 17:19:20 -04:00
parent 7257589a46
commit 2fcc1b30c7
1 changed files with 5 additions and 10 deletions
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13
dlib/byte_orderer/byte_orderer_kernel_1.h
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@ -136,14 +136,9 @@ namespace dlib
- reverses the byte ordering in item - reverses the byte ordering in item
!*/ !*/
{ {
// this is just here to provide a compile time check that T is a POD. DLIB_ASSERT_HAS_STANDARD_LAYOUT(T);
// this checks *most* of the requirements for being a POD type.
// You should not be calling this function on non POD types!
union
{
int a;
T value; T value;
} temp;
// If you are getting this as an error then you are probably using // If you are getting this as an error then you are probably using
// this object wrong. If you think you aren't then send me (Davis) an // this object wrong. If you think you aren't then send me (Davis) an
@ -161,11 +156,11 @@ namespace dlib
const size_t size = sizeof(T); const size_t size = sizeof(T);
unsigned char* const ptr = reinterpret_cast<unsigned char*>(&item); unsigned char* const ptr = reinterpret_cast<unsigned char*>(&item);
unsigned char* const ptr_temp = reinterpret_cast<unsigned char*>(&temp.value); unsigned char* const ptr_temp = reinterpret_cast<unsigned char*>(&value);
for (size_t i = 0; i < size; ++i) for (size_t i = 0; i < size; ++i)
ptr_temp[size-i-1] = ptr[i]; ptr_temp[size-i-1] = ptr[i];
item = temp.value; item = value;
} }
bool little_endian; bool little_endian;