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#ifndef INCLUDED_CATEGORY_
#define INCLUDED_CATEGORY_
#include <unordered_map>
#include <system_error>
//caterr
enum class CatErr
{
Err1 = 1, // causes of errors
Err2,
Err3
};
//=
//iscodeenum
namespace std
{
template <>
struct is_error_code_enum<CatErr>: public true_type
{};
}
//=
std::error_code make_error_code(CatErr ce);
// -------------------------------------------------------------------
//cond
enum class Cond
{
NoCond = -1,
Cond1 = 1,
Cond2,
Cond3,
};
//=
//iscondenum
namespace std
{
template <>
struct is_error_condition_enum<Cond>: public true_type
{};
}
//=
std::error_condition make_error_condition(Cond ec);
// -------------------------------------------------------------------
//category
class Category: public std::error_category
{
static Category s_instance;
struct POD
{
Cond cond;
char const *msg;
};
static std::unordered_map<CatErr, POD> s_map;
public:
Category(Category const &other) = delete;
static Category &instance();
bool equivalent(std::error_code const &ec, int condNr)
const noexcept override;
bool equivalent(int ev, std::error_condition const &condition)
const noexcept override;
std::error_condition default_error_condition(int ev)
const noexcept override;
std::string message(int ce) const override;
char const *name() const noexcept override;
private:
Category() = default;
template <typename Enum>
static constexpr Enum as(int err);
};
//=
template <typename Enum>
inline constexpr Enum Category::as(int value)
{
return static_cast<Enum>(value);
}
#endif
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