Iinitializing a constexpr std::array of pairs
You are almost there. First of all, the char const[] type needs to be a pointer instead, because it is an incomplete type, that may not be held in a std::pair. And secondly, you are missing a pair of braces. The correct declaration will look like this:
constexpr std::array<std::pair<int, const char*>, 3> strings = {{ {0, "Int"}, {1, "Float"}, {2, "Bool"},}};The extra braces are required because std::array is an aggregate holding a raw C array, and so we need the braces mentioned explicitly so that {0, "Int"} is not taken erroneously as the initializer for the inner array object.