On Saturday, 1 November 2014 at 15:00:57 UTC, Shriramana Sharma
via Digitalmars-d-learn wrote:
In the following pages:
http://dlang.org/interfaceToC.html
http://dlang.org/cpp_interface
the "Data Type Compatibility" section says D int is compatible
with
C/C++ int. Isn't this actually false because D's integer types
are
fixed-size whereas C/C++'s are variable? So D int is only
compatible
with C++ int32_t, and who knows what that is typedef-ed to?
Likewise
for uint, long, short etc.
So how to ensure, when calling C/C++, that the D int etc are
being
mapped to the correctly-sized C/C++ type? Does the compiler
ensure
that since the compatibility is being advertised as built-in?
Note this at the end of the "Data Type Compatiblity" section:
"These equivalents hold for most C compilers. The C standard does
not pin down the sizes of the types, so some care is needed."
D's built-in types do not change based on the companion C
compiler. When linking to C, it is the programmers responsibility
to ensure they are using the right types.
core.stdc.config can help deal with the most common
inconsistencies.
