I have boost-program-options version 1.78 installed via vcpkg. When I compile with clang++ and -std=c++20 I get the following errors. This doesn't happen when I compile with g++. According to this ...

I'm looking for a unary functor which will dereference it's argument and return the result. Of course I can write one, it just seemed like something should already exist. So given the code: const...

I found that binary_function is removed from C++11. I am wondering why. C++98: template <class T> struct less : binary_function <T,T,bool> { bool operator() (const T& x, const T&...

Given the following code that does a reverse lookup on a map: map<char, int> m = {{'a', 1}, {'b', 2}, {'c', 3}, {'d', 4}, {'e', 5}}; int findVal = 3; Pair v = *find_if(m.begin(), m.end()...