从size_t转换为unsigned int [英] convert from size_t to unsigned int
问题描述
大家好，
从size_t转换为unsigned int时，会出现一条警告消息，
警告C4267：''=''：从''size_t''转换为''int''，可能会丢失数据
我不知道为什么，因为在crtdbg.h中，size_t被定义为int，对吗？
提前感谢，
George
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
推荐答案
" George"写道：
"George" wrote:
从size_t转换为unsigned int时，会出现一条警告信息，
警告C4267：'' =''：从''size_t''转换为''int''，可能会丢失数据
我不知道为什么，因为在crtdbg.h中，size_t被定义为int，对吗？
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?
不，它被定义为unsigned int。并且你没有从size_t转换为
unsigned int，否则警告信息就不会出现。
best
doc
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
嗨doc，
我正在使用VS 2003.我发现即使我转换为unsigned int，错误
消息是一样的。
你知道原因吗？
问候，
乔治
" docschnipp"写道：
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"写道：
"George" wrote:
从size_t转换为unsigned int时，会出现一条警告信息，
警告C4267：'' =''：从''size_t''转换为''int''，可能会丢失数据
我不知道为什么，因为在crtdbg.h中，size_t被定义为int，对吗？
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?
不，它被定义为unsigned int。并且你没有从size_t转换为
unsigned int，否则警告信息就不会出现。
best
doc
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写道：
::嗨doc，
::
::
::我正在使用VS 2003.我发现即使我转换为unsigned int，
::错误信息也是一样的。
::
::你知道原因吗？
1）这是兼容性警告，因为size_t没有在所有系统上都必须具有相同大小的
。特别是，对于64位编译，它与32位编译不同。
http://msdn2.microsoft.com/en-us/lib...93(VS.80).aspx
2）你为什么要首先这样做？为什么不使用size_t
变量？
Bo Persson
::
::
::问候，
:: George
::
::" docschnipp"写道：
::
:::" George"写道：
:::
::::当从size_t转换为unsigned int时，会有一个
::::警告消息，
::::
::::警告C4267：''=''：从''size_t''转换为''int''，可能
::::数据丢失
::::
::::我不知道为什么，因为在crtdbg.h中，size_t定义为int，
::::对吗？
:::
:::不，它被定义为无符号INT。并且你没有将
:::从size_t转换为unsigned int，否则警告消息
:::不会出现。
:::
:::最好
::: 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
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