D:\GitHub\STL\out\x64>type meow.cpp
#include <print>
#include <ranges>
#include <vector>
using namespace std;
int main() {
const vector<int> vec{11, 22, 33};
auto always_true = [](const auto&) { return true; };
for (const auto& [e0, e1] : views::cartesian_product(vec, vec) | views::filter(always_true)) {
println("{} {}", e0, e1);
}
}D:\GitHub\STL\out\x64>cl /EHsc /nologo /W4 /std:c++latest /MTd /Od meow.cpp
meow.cpp
D:\GitHub\STL\out\x64\out\inc\ranges(2403): warning C4324: 'std::ranges::filter_view<std::ranges::cartesian_product_view<std::ranges::ref_view<const std::vector<int,std::allocator<int>>>,std::ranges::ref_view<const std::vector<int,std::allocator<int>>>>,main::<lambda_1>>': structure was padded due to alignment specifier
D:\GitHub\STL\out\x64\out\inc\ranges(2403): note: the template instantiation context (the oldest one first) is
D:\GitHub\STL\out\x64\out\inc\ranges(198): note: while compiling class template member function 'decltype(auto) std::ranges::_Range_closure<std::ranges::views::_Filter_fn,main::<lambda_1>>::operator ()(_Ty &&) noexcept(<expr>) &'
D:\GitHub\STL\out\x64\out\inc\ranges(930): note: while evaluating concept 'invocable<std::ranges::views::_Filter_fn,std::ranges::cartesian_product_view<std::ranges::ref_view<std::vector<int,std::allocator<int> > const >,std::ranges::ref_view<std::vector<int,std::allocator<int> > const > >,`main'::`2'::<lambda_1> &>'
D:\GitHub\STL\out\x64\out\inc\ranges(2418): note: see reference to class template instantiation 'std::ranges::filter_view<std::ranges::cartesian_product_view<std::ranges::ref_view<const std::vector<int,std::allocator<int>>>,std::ranges::ref_view<const std::vector<int,std::allocator<int>>>>,main::<lambda_1>>' being compiled
D:\GitHub\STL\out\x64>meow
11 11
11 22
11 33
22 11
22 22
22 33
33 11
33 22
33 33