On Monday, 30 April 2018 at 10:48:40 UTC, Jonathan M Davis wrote:
On Monday, April 30, 2018 01:07:35 NewUser via
Digitalmars-d-learn wrote:
Hi,
How do I pass a d string to a c++ std::string?
The most straightforward way would be to create a C or C++
function which accepts const char* and size_t and then creates
the std::string, in which case you pass it arr.ptr (or &arr[0])
and arr.length from D (and you could create a D helper function
that takes a dynamic array to then call the C/C++ function if
you don't want to use the array properties directly every time).
Essentially, you'll probably end up creating wrapper functions
for any C++ functions that you want to call that take
std::string, since there is not currently a straightforward way
to construct a std::string from D (there's Calypso, but using
it means that you're tied to ldc). Solutions are likely
forthcoming, but there's nothing production-ready at this
point. Do interacts reasonably well when it's operatoring on
pointers to C++ classes, but as soon as it has to deal with
construction or destruction, things get more complicated (which
means that C++ classes on the stack definitely get more
complicated). You can still get things to work, but it's
frequently not straightforward in the way that calling C
functions is.
- Jonathan M Davis
Thanks.
