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康桓瑋 has asked 90 questions and find answers to 83 problems.

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康桓瑋 questions

Why can't the compiler use the std::string conversion function of the class when perform operator<<?
The problem of libstdc++‘s implementation of std::declval
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?

康桓瑋 answers

C++23: Is it valid to modify the elements of a `zip_view`?
Can we use custom formatters for std strings?
C++ back method for sub-range not found after chunking list
Check if class is derived from templated class
Joining a range of strings with a delimiter using standard ranges
Understanding return type of std::ranges::sort with temporary and prvalue arguments
How to make join view in C++ preserving random access?
Is it valid to join a transform view whose elements are temporary containers?
std::optional<std::unique_ptr<int>> is not constexpr?
Are c++20 iterators "convertible" to LegacyIterators?