lang.hpp

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#pragma once
 
// welder is C++26-and-newer only and is built on P2996 reflection. On the one
// toolchain that implements it today, gcc-16, that means `-std=c++26 -freflection`,
// which together define __cpp_impl_reflection. We check the capability here — the
// first header any welder TU pulls in (via <welder/vocabulary.hpp>) — so a
// misconfigured target fails with this one clear message instead of a wall of
// syntax errors deeper in the machinery. welder deliberately does NOT force the C++
// standard onto your target from CMake (no INTERFACE cxx_std_26): the language level
// is your project's dial to set. (Broaden the macro check as other compilers land
// P2996.)
#if !defined(__cpp_impl_reflection)
#  error "welder requires C++26 reflection. On gcc-16 build this target with " \
         "`-std=c++26 -freflection` (set CMAKE_CXX_STANDARD to 26 or newer). " \
         "See the welder \"Getting started\" guide."
#endif

 
namespace welder::inline v0 {

enum class lang : unsigned char {
    py,   
    lua,  
};

template <unsigned char Slot>
    requires (Slot < 16)
inline constexpr lang user_lang{static_cast<lang>(16 + Slot)};
 
} // namespace welder