downs Wrote: > I've just committed a module to tools (tools.cpp, > http://dsource.org/projects/scrapple/Trunk/tools/tools/cpp.d ) that should > enable linking and using any C++ library with D programs without creating a C > wrapper for it. > > The code has been tested with a simple multiple-inheritance sample: > http://paste.dprogramming.com/dpv8hpjp > > The D code to bind to this is http://paste.dprogramming.com/dphlv1ot . It > requires a symlink to the tools folder in its directory. > > Caveats: > > - D1 > - Only works on g++4's "newapi" layout and mangling (but should be > reasonably portable). > - Diamond pattern is untested and unsupported. > - Class protection is completely unsupported - public only. > - RTTI must be generated manually (normally the compiler would do this). See > the D half of the sample. > - Dynamic casting from and to generated classes is not implemented. > - The C++ code that does this is long and full of special cases, so > - For the example, I ended up hardcoding a manual translation between A > and B. > - If you need dynamic casting, I recommend hardcoding the required paths > based on classinfo pointer comparisons. > - The C++ DSL parser is not very tested. Occasional bugs may occur. > - When building with LDC, fixup_vtable() needs to be called for every newly > created C++ class object. > - This is because LDC does not yet support initialization from global > variable addresses. > > Building the sample is a two-step process: > > g++ test.cpp -c -g -o test.o > gdc -J. cpp_demo.d tools/cpp.d tools/base.d tools/smart_import.d tools/ctfe.d > tools/compat.d tools/text.d tools/tests.d tools/log.d test.o \ > -o cpptest -lstdc++ -L /usr/lib/gcc/i686-pc-linux-gnu/4.3.2/ -g # adapt > library path as appropriate > > > Writing this also gave us what I believe to be a fair contender to Most > Horrifying Statement of D Ever Written: > > fndefs ~= `mixin("extern(C) `~t~` "~`~mname~`~"`~fnparams~`; ");`~'\n'~ > `mixin("`~fn~`("~refToParamList("Params!(typeof(&"~`~mname~`~"))", > isRef!(typeof(mixin("&"~`~mname~`))))~") { > return > "~`~mname~`~"("~refToValueList(isRef!(typeof(mixin("&"~`~mname~`))))~"); > } > "); `; > > --downs
if you have problems seeing the first link: http://dsource.org/projects/scrapple/browser/trunk/tools/tools/cpp.d
