The wording of the question title is probably incorrect and I'll fix it happily from your suggestions. My question can be illustrated by this snippet: #include <array> template <typename ...

The keyword constexpr enforced pretty tight restrictions on functions on its introduction into the C++11 standard. These restrictions were loosened with C++14 and C++20 (most noteworthy): C++14 al...

It seems to me that having a "function that always returns 5" is breaking or diluting the meaning of "calling a function". There must be a reason, or a need for this capability ...

Is there a way to write a constexpr function that returns how deep a std::vector is nested? Example: get_vector_nested_layer_count<std::vector<std::vector<int>>>() // 2 get_...

Recently I was surprised that the following code compiles in clang, gcc and msvc too (at least with their current versions). struct A { static const int value = 42; }; constexpr int f(A a) { retu...

I'm having some trouble with constexpr. The book C++ Primer shows a line of code: constexpr int sz = size(); // only size() is a constexpr function // this code is right However the book doesn't...

Consider the following code: static constexpr int make_const(const int i){ return i; } void t1(const int i) { constexpr int ii = make_const(i); // error occurs here (i is not a constant express...