On 2011-02-26 17:58, simendsjo wrote:
On 26.02.2011 17:06, Mike Wey wrote:
On 02/26/2011 11:49 AM, Jacob Carlborg wrote:
On 2011-02-26 01:28, simendsjo wrote:
C is not my strong side, so I'm having some problems wrapping some
code.
I found a couple of sources on this:
1) http://www.digitalmars.com/d/2.0/htomodule.html
2) http://www.digitalmars.com/d/2.0/interfaceToC.html
1)
C's long is the same as D's int.
long long is long
2)
C 32bit's long long is D's long, C 64 bits long is D's long.
So.. A long in C is the same as the platform size? And long long
doesn't
exist in 64 bit?
In general you can follow the table at
http://www.digitalmars.com/d/2.0/htomodule.html
But when it comes to "long" in C you have to be careful. On 32bit
platforms a C "long" will be 32bit long. But on 64bit platforms it
depends of what data model is used. To simplify things:
* On Windows 64bit a C "long" will be 32bit long
* On Posix 64bit a C "long" will be 64bit long.
What you can do is to create an alias called "c_long" and "c_ulong",
something like this:
version (D_LP64)
{
version (Windows)
{
alias int c_long;
alias uint c_ulong;
}
else
{
alias long c_long;
alias ulong c_ulong;
}
}
else
{
alias int c_long;
alias uint c_ulong;
}
To read more about data models:
http://en.wikipedia.org/wiki/64-bit#Specific_C-language_data_models
You can also import core.stdc.config witch defines both c_long and
c_ulong.
Thanks for all the answers. Is something like this correct?
version(X86_64)
{
version(Windows)
{
version = LLP64;
}
else version(Posix)
{
version = LP64;
}
else
{
static assert(0);
}
version(LLP64)
{
alias short c_short;
alias ushort c_ushort;
alias int c_int;
alias uint c_uint;
alias int c_long;
alias uint c_ulong;
alias long c_longlong;
alias ulong c_ulonglong;
alias ulong c_size_t;
}
else version(LP64)
{
alias short c_short;
alias ushort c_ushort;
alias int c_int;
alias uint c_uint;
alias long c_long;
alias ulong c_ulong;
alias long c_longlong;
alias ulong c_ulonglong;
alias ulong c_size_t;
}
else version(ILP64)
{
alias short c_short;
alias ushort c_ushort;
alias long c_int;
alias ulong c_uint;
alias long c_long;
alias ulong c_ulong;
alias long c_longlong;
alias ulong c_ulonglong;
alias ulong c_size_t;
}
else version(SILP64)
{
alias long c_short;
alias ulong c_ushort;
alias long c_int;
alias ulong c_uint;
alias long c_long;
alias ulong c_ulong;
alias long c_longlong;
alias ulong c_ulonglong;
alias ulong c_size_t;
}
else
{
static assert(0);
}
}
else version(X86)
{
alias short c_short;
alias ushort c_ushort;
alias int c_int;
alias uint c_uint;
alias int c_long;
alias uint c_ulong;
alias long c_longlong;
alias ulong c_ulonglong;
alias uint c_size_t;
}
else
{
static assert(0);
}
I suggest you use core.stdc.config instead, I forgot it existed. BTW
size_t already exists in D (defined in the object module) and it will be
the same as size_t in C.
--
/Jacob Carlborg
