Could you compile this with master?
```
struct position
{
float x, y;
};
struct velocity
{
float x, y;
};
int main()
{
auto tup = hana::make_tuple(position{1,2}, velocity{1,2});
auto tup_ref = hana::transform(tup, [](auto& t) { return std::ref(t); });
auto test = hana::filter(tup_ref, [](auto& tref){
return hana::bool_c<true>;
});
}
I don't remember how I fixed that on mine.
readelf -sV /usr/lib/libstdc++.so.6 | sed -n 's/.*@@GLIBCXX_//p' | sort -u -V | tail -1
gives me version 3.4.21
We could always have multiple branches with different tweaks to run benchmarks on and contrast and compare.
I was actually thinking about making another PR to attempt to improve
hana::pair. (maybe it would be faster if it wasn't a wrapper for a basic_tuple idk)
I also removed the fast lane for looking up
hana::types, since it was broken (the specialization would never match), and I did not take time to reimplement it properly.
I also rebased the branch on top of
develop. Check the changes out, then we’ll discuss them.
It was probably here: http://www.boost.org/community/generic_programming.html#tag_dispatching
Even an empty struct gets copied.
; Function Attrs: uwtable
define i32 @main() #3 {
%1 = alloca %struct.Silent, align 1
call void @_Z5helloI6SilentEvT_()
ret i32 0
}
; Function Attrs: nounwind uwtable
define linkonce_odr void @_Z5helloI6SilentEvT_() #4 comdat {
%1 = alloca %struct.Silent, align 1
ret void
}
@ldionne Did your clang built-in ever get looked at?
Is there an alternative to unpack?
auto r4 =
hana::unpack(t, [](auto&... r) { return ranges::view::concat(r...); });
this will always crash the compiler :(
I need to pass the elements of a tuple to a function
int
main()
{
std::vector<int> iv{ 1, 3, 4, 5 };
std::vector<float> fv{ 1, 3, 4, 5 };
auto r1 = ranges::view::all(iv);
auto r2 = ranges::view::all(fv);
auto r3 = ranges::view::zip(r1, r2);
auto rint =
ranges::view::zip(r3, ranges::view::closed_ints(0ul, ranges::size(r3)));
auto t = hana::make_tuple(rint, rint);
auto r4 =
hana::unpack(t, [](auto&... r) { return ranges::view::concat(r...); });
//crash
for(auto t: r4){
}
}
oh nvm sorry, it is completely unrelated to hana.
@MaikKlein You can try
clang++ -E -x c++ - -v < /dev/null and see if the header search paths help you. Otherwise, see this SO question.
@ricejasonf
Did your clang built-in ever get looked at?
Not yet... Still waiting.
The search bar in the docs appears to be broken.
How is it broken? It seems to work for me.