I am not an elderly in C or C ++. I do not know how time_t is defined and Is designed. Many posts like:
-
But these posts only show that
Time_t or
size_t . It does not clearly tell where the time is defined and declared and the declared time_t or size is there.
I am using WIN8 VS2012 Express C ++ . I searched the library and found that
size_t to
crtdefs.h instead of
cstddef is defined.
- Why do you need type like
size_t ,
time_t ? We can return
sizeof just
unsigned int .
Why does not the C ++ Library define
size_t
Can I say that size_t no is a C / C + Is the underlying type?
I have
size_t or
time_t in my code (perhaps defined in the
std namespace).
I searched again in the library and found
size_t is defined as
typedef _W64 unsigned int size_t , and
_W64 is defined as
__w64 . Here, I can not find more where
__w64 is defined or declared.
- What is the type of
__w64 ? It has not been told in the C ++ 11 / C99 standard
Similarly when I searched for
time_t , I would like to see the
__i int6 Found. But it does not know where from
__ int64 comes from.
A Microsoft specific extension that enables warnings when compiling with "/ wp64" - its Usage is used to identify "dangerous" code if you are trying to compile it for 64-bit - for example specifying a 64-bit value in 32-bit one Example: < Pre>
size_t s; ... unsigned int i; ... i = s; // 32bit can not take all 64 bit values - the probable problem is the definition of
size_t and
time_t is
typedef. Size_t; and
typedef ... time_t; - They are "not fixed" in the compiler Standards say that they have to be there (and the compiler targets to be suitable for the system). I think that you think that
cstddef will contain some place or some other in
crtdefs.h .
This is a Microsoft compiler type. This compiler is defined by itself. It can then be used to define another "type of type", such as
time_t or
size_t (appropriate
unsigned ) It may not be of this type in other compilers, but there will be some way of defining 8, 16, 32 and 64-bit integers. The actual origin of
__ int64 is probably before the origin of
longer , which was not supported by Microsoft for long time (micron intentions) I believe It is now.
- What is the type of
- Why do you need type like
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