Re: [boost] [gsoc17] Project1: Static map: Can I implement the competency test in g++-7?

And my question is, am I allowed to implement the competency test of static_map in g++-7? I have just implemented my own version of static_map which supports the following operations:

constexpr StaticMap m(make_pair(2, "abc"), make_pair(4, "def"), make_pair(6, "ghi"));

if (!m[4]) abort(); const char *foo = m[2]; return 0;

Note the compiler will elide m[2] in any case because you do nothing with its result. Therefore the compiler can assume the call does nothing and remove it.

So I was wondering did I pass the test?

Maybe. You should be aware that other students have submitted some really good implementations already, ones which work perfectly on both GCC and clang and have a STL idiomatic API and have O(1) compile time complexity and O(N) storage overheads. I have yet to see a student submit a working implementation for Visual Studio however (VS2017 finally has full constexpr, it should be doable). Also remember that the mapped values by static_map are *mutable* even though the map itself is all compile-time. And the mutability should be compiled into minimum assembler e.g.: m[2] = 5; turns into: lea addr_of_map, %eax; movl #5, [%eax, #someoffset]; ... or something similarly minimum. Feel free to email me privately with a link to your implementation for a quick review. Niall -- ned Productions Limited Consulting http://www.nedproductions.biz/ http://ie.linkedin.com/in/nialldouglas/