The code below fails to compile on GCC and CLang (msvc fails because of the experimental/propagate_const).

I want to get the type of the iterator to the const-casted contents of the vector. I thought I can use decltype for it.

I want to get the type of the iterator to the const-casted contents of the vector. I thought I can use decltype for it.

I want to get the type of the iterator to the const-casted contents of the vector. I thought I can use decltype for it.

Suppose I have vector of pointers to objects of class Widget, which are heavy objects with no owner. More often than not, my code needs to iterate over this vector, but needs only access to const Widget.

While reading C++ 20 book came across this function:

I have a header file of constants shared among both C++ and C executables. I don’t want to duplicate the constants which I want as constexpr in C++ and #defines in C.

I’m having a hard time seeing the practical difference between std::fill_n and std::ranges::fill_n.

I am iterating over an argument sequence at compile-time, and I want to check if one of the arguments may be a span. If so, I will do span-things.

I am using std::generate to construct a struct and push into a vector. In order to construct the struct, I need to refer to the previous struct in the sequence. Is there any way to do this in c++20 ? I would rather not use boost or a 3rd party library.
Thank you!