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康桓瑋 has asked 88 questions and find answers to 70 problems.

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康桓瑋 questions

How to project elements nestedly in c++20 constrained algorithms?
What is the rationale behind the iterator/sentinel of range adaptors providing the base() accessor?
Why the standard defines borrowed_subrange_t as common_range?
The redundancy of forward_iterator concept?
Why is ranges::basic_istream_view::begin() not cached?
C++20 concepts require operator overloading combine with user-define template operator overloading function
How to define a concept of a object that is can be structured binding?
Assignment operator of std::variant of custom type with deleted special member functions?
what are the constraints for std::ranges::make_heap?
Why does `iota(0) | take(0)` not model ranges::sized_range in C++20?

康桓瑋 answers

Is std::views::keys guaranteed to work correctly with any pair/tuple type?
In what situations does `ranges::for_each` work but `for (auto&& elt : rg)` fail?
How to iterate over the size of a parameter pack with a compile-time index parameter
C++23: How to erase a subrange from vector
C++ concept that checks a value for requirements
Why can't I use lazy_split_view with a istream view instead of a string_view?
How to limit the template parameter to only floating point type
C++ function parameter that only accepts iterator to a specific type
count std::optional types in variadic template tuple
How can I enable/disable a function depending on the size of an array?