ast-al / rangeless Goto Github PK
View Code? Open in Web Editor NEWc++ LINQ -like library of higher-order functions for data manipulation
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Recent compilers are warning about pessimizations
I have been playing around with rangeless as a faster compiling alternative to std::ranges and ranges-v3. I have been getting some compiler warnings that there are redundant or pessimizing moves in fn::transform and in fn::take_while. Would you consider removing the unnecessary std::move wrappers on lines 1592 and 1846? See this example. Thanks.
std::inserter not found
I get a compiler error when trying to use this library with a C++17 msvc2019 project:
"inserter" is not a member of "std"
Adding #include <iterator> fixes this.
I would send a pull request, but I am not experienced enough in C++ to have the confidence.
exists_where doesn't work after fn::transform
The exists_where operation takes a const Iterable& which makes it fail when used after fn::transform or other operators... I think that ones that generate seq? The issue seems to be that seq.begin is a non-const operation because seq is consumable.
I think that exists_where should work like for_each or foldl, both of which take Iterable&&. It's really just a foldl with a fixed algorithm that can return early.
First invocation works, second one doesn't:
std::vector<int> a = {1, 2, 3};
a % fn::exists_where([](auto item_a) { return item_a == 1; });
a % fn::transform([](auto item_a) { return item_a; }) % fn::exists_where([](auto item_a) { return item_a == 1; });
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