Hello everyone,
When converting from size_t to unsigned int, there will be a warning message,
warning C4267: '=' : conversion from 'size_t' to 'int', possible loss of data
I do not know why, since in crtdbg.h, size_t is defined to int, right?
thanks in advance,
George
25  11677 
"George" wrote:
When converting from size_t to unsigned int, there will be a warning message,
warning C4267: '=' : conversion from 'size_t' to 'int', possible loss of data
I do not know why, since in crtdbg.h, size_t is defined to int, right?
No, it is defined to unsigned int. And you are not converting from size_t to
unsigned int, otherwise the warning message wouldn't come up.
best
doc
Hi doc,
I am using VS 2003. I find that even if I convert to unsigned int, the error
message is the same.
Do you know the reason?
regards,
George
"docschnipp " wrote:
"George" wrote:
When converting from size_t to unsigned int, there will be a warning message,
warning C4267: '=' : conversion from 'size_t' to 'int', possible loss of data
I do not know why, since in crtdbg.h, size_t is defined to int, right?
No, it is defined to unsigned int. And you are not converting from size_t to
unsigned int, otherwise the warning message wouldn't come up.
best
doc
George wrote:
:: Hi doc,
::
::
:: I am using VS 2003. I find that even if I convert to unsigned int,
:: the error message is the same.
::
:: Do you know the reason?
1) It is a compatibility warning, because size_t doesn't have to be
the same size on all systems. Particularly, for 64 bit compiles it is
different from a 32 bit compile. http://msdn2.microsoft.com/en-us/lib...93(VS.80).aspx
2) Why do you want to do this in the first place? Why not use a size_t
variable?
Bo Persson
::
::
:: regards,
:: George
::
:: "docschnipp " wrote:
::
::: "George" wrote:
:::
:::: When converting from size_t to unsigned int, there will be a
:::: warning message,
::::
:::: warning C4267: '=' : conversion from 'size_t' to 'int', possible
:::: loss of data
::::
:::: I do not know why, since in crtdbg.h, size_t is defined to int,
:::: right?
:::
::: No, it is defined to unsigned int. And you are not converting
::: from size_t to unsigned int, otherwise the warning message
::: wouldn't come up.
:::
::: best
::: doc
George wrote:
Hello everyone,
When converting from size_t to unsigned int, there will be a warning message,
warning C4267: '=' : conversion from 'size_t' to 'int', possible loss of data
I do not know why, since in crtdbg.h, size_t is defined to int, right?
George:
No, In Win32 size_t is unsigned int. The error message says size_t to
int (not size_t to unsigned int as in your question).
In Win64 (or with Win64 warnings turned on), you will get a warning for
converting size_t to unsigned int, because in Win64 size_t is an
unsigned 64-bit value.
Just use an explicit cast. Although I use C++ casts in other contexts,
for simple integer conversions I normally use C-style cast:
size_t n1 = 12345;
int n2 = (int)n1;
--
David Wilkinson
Visual C++ MVP
"Bo Persson" wrote:
>
2) Why do you want to do this in the first place? Why not use a size_t
variable?
I guess the reason is as usual: using several pieces of code, one is using
size_t, others, not originating the Windows platform, use int or unsigned
int.
best
doc
Hi,
I am using 32-bit machine. I need to pass the size_t to another function
which accepts unsigned int.
I think it is ok to pass size_t to unsigned int, but I do not know why there
is warning.
regards,
George
"Bo Persson" wrote:
George wrote:
:: Hi doc,
::
::
:: I am using VS 2003. I find that even if I convert to unsigned int,
:: the error message is the same.
::
:: Do you know the reason?
1) It is a compatibility warning, because size_t doesn't have to be
the same size on all systems. Particularly, for 64 bit compiles it is
different from a 32 bit compile.
http://msdn2.microsoft.com/en-us/lib...93(VS.80).aspx
2) Why do you want to do this in the first place? Why not use a size_t
variable?
Bo Persson
::
::
:: regards,
:: George
::
:: "docschnipp " wrote:
::
::: "George" wrote:
:::
:::: When converting from size_t to unsigned int, there will be a
:::: warning message,
::::
:::: warning C4267: '=' : conversion from 'size_t' to 'int', possible
:::: loss of data
::::
:::: I do not know why, since in crtdbg.h, size_t is defined to int,
:::: right?
:::
::: No, it is defined to unsigned int. And you are not converting
::: from size_t to unsigned int, otherwise the warning message
::: wouldn't come up.
:::
::: best
::: doc
Hi doc,
I do not know why in Visual Studio 2003, there is warning message when
converting from size_t to unsigned int. I think they are the same?
Any ideas?
regards,
George
"docschnipp " wrote:
"Bo Persson" wrote:
2) Why do you want to do this in the first place? Why not use a size_t
variable?
I guess the reason is as usual: using several pieces of code, one is using
size_t, others, not originating the Windows platform, use int or unsigned
int.
best
doc
Hi David,
When converting from size_t to unsigned int, there are still warning message
in Visual Studio 2003. You can have a try. I have no idea why converting to
unsigned int has warning information.
regards,
George
"David Wilkinson" wrote:
George wrote:
Hello everyone,
When converting from size_t to unsigned int, there will be a warning message,
warning C4267: '=' : conversion from 'size_t' to 'int', possible loss of data
I do not know why, since in crtdbg.h, size_t is defined to int, right?
George:
No, In Win32 size_t is unsigned int. The error message says size_t to
int (not size_t to unsigned int as in your question).
In Win64 (or with Win64 warnings turned on), you will get a warning for
converting size_t to unsigned int, because in Win64 size_t is an
unsigned 64-bit value.
Just use an explicit cast. Although I use C++ casts in other contexts,
for simple integer conversions I normally use C-style cast:
size_t n1 = 12345;
int n2 = (int)n1;
--
David Wilkinson
Visual C++ MVP
George wrote:
Hi David,
When converting from size_t to unsigned int, there are still warning message
in Visual Studio 2003. You can have a try. I have no idea why converting to
unsigned int has warning information.
regards,
George
"David Wilkinson" wrote:
>George wrote:
>>Hello everyone,
When converting from size_t to unsigned int, there will be a warning message,
warning C4267: '=' : conversion from 'size_t' to 'int', possible loss of data
I do not know why, since in crtdbg.h, size_t is defined to int, right?
George:
No, In Win32 size_t is unsigned int. The error message says size_t to
int (not size_t to unsigned int as in your question).
In Win64 (or with Win64 warnings turned on), you will get a warning for
converting size_t to unsigned int, because in Win64 size_t is an
unsigned 64-bit value.
Just use an explicit cast. Although I use C++ casts in other contexts,
for simple integer conversions I normally use C-style cast:
size_t n1 = 12345;
int n2 = (int)n1;
--
David Wilkinson
Visual C++ MVP
George:
Maybe you have 64-bit warnings turned on (a good idea, in my opinion).
Look in project properties under
Configuration Properties -C/C++ -General.
--
David Wilkinson
Visual C++ MVP This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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