ctai_tokens_2.hpp

namespace details
{
    template <typename>
    struct token_to_reg_opcode_impl;
	
    template <> struct token_to_reg_opcode_impl<tokens::tok_eax> { static constexpr auto value = regs::to_size<regs::id_t::EAX>; };
    template <> struct token_to_reg_opcode_impl<tokens::tok_ebx> { static constexpr auto value = regs::to_size<regs::id_t::EBX>; };
    ...	
}

template <typename token>
constexpr auto token_to_reg_opcode = details::token_to_reg_opcode_impl<token>::value;