D Language accepted for inclusion in GCC

Re:D Language accepted for inclusion in GCC by _yosefk on Wednesday June 21, 2017 @11:17AM (#14604517)

Most useful C++ code is either not templates or it's templates which can be instantiated a finite number of times and then used like non-templated code. Most "header-only"/header-heavy C++ libraries which present the problem you mention solve problems like C++'s smart for loop working like "for x in xs" does in Python but not working like "for x,y in zip(xs,ys)" does or like "for i,x for enumerate(xs)" does etc.; you don't really need these outside C++ (whether you need them inside C++ is another question but it's irrelevant here.)

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Re:D Language accepted for inclusion in GCC by CJefferson on Wednesday June 21, 2017 @11:27AM (#14604599)

That sounds ..wrong. what about the C++ standard library? Neither vector or sort sounds like that?

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Re:D Language accepted for inclusion in GCC by yorwba on Wednesday June 21, 2017 @11:37AM (#14604700)

Those > can be instantiated a finite number of times and then used like non-templated code.

So you have a C++ file that uses vector<int>, vector<struct c_struct>, vector<CppClass>, vector<DClass>, etc. once and then you can link to them from D code.

The only case where that doesn't work is when you have lots of one-off instantiations, where requiring an instantiation in C++ code for each use in D would get annoying quickly.

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Re:D Language accepted for inclusion in GCC by amelius on Wednesday June 21, 2017 @12:13PM (#14605054)

Does the D compiler know how to mangle/demangle C++ names?

Do you have to write some kind of D header file for foreign C++ functions? Otherwise, how would D even know about the existence of e.g. vector<int>::push?

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Re:D Language accepted for inclusion in GCC by biotronic on Wednesday June 21, 2017 @12:24PM (#14605186)

https://dlang.org/spec/cpp_interface.html#cpp-templates

You will need to recreate the C++ function definitions in D and mark them extern(C++), but that's about it.

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Re:D Language accepted for inclusion in GCC by pzone on Wednesday June 21, 2017 @01:20PM (#14605858)

Those parts of the C++ standard library are header-only and will be instantiated with concrete types at compile-time.

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