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multicast<> rewritten

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This commit is contained in:
Nekotekina 2016-08-07 17:06:37 +03:00
parent 1a7ea2d235
commit 71441819e5
1 changed files with 14 additions and 25 deletions
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37
Utilities/types.h
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@ -461,40 +461,29 @@ using any16 = any_pod<simple_t, sizeof(u16)>;
using any32 = any_pod<simple_t, sizeof(u32)>; using any32 = any_pod<simple_t, sizeof(u32)>;
using any64 = any_pod<simple_t, sizeof(u64)>; using any64 = any_pod<simple_t, sizeof(u64)>;
// Allows to define integer convertible to multiple enum types // Allows to define integer convertible to multiple types
template<typename T = void, typename... Ts> template<typename T, T Value, typename T1 = void, typename... Ts>
struct multicast : multicast<Ts...> struct multicast : multicast<T, Value, Ts...>
{ {
static_assert(std::is_enum<T>::value, "multicast<> error: invalid conversion type (enum type expected)"); constexpr multicast() = default;
multicast() = default; // Implicit conversion to desired type
constexpr operator T1() const
template<typename UT>
constexpr multicast(const UT& value)
: multicast<Ts...>(value)
, m_value{ value } // Forbid narrowing
{ {
return static_cast<T1>(Value);
} }
constexpr operator T() const
{
// Cast to enum type
return static_cast<T>(m_value);
}
private:
std::underlying_type_t<T> m_value;
}; };
// Recursion terminator // Recursion terminator
template<> template<typename T, T Value>
struct multicast<void> struct multicast<T, Value, void>
{ {
multicast() = default; constexpr multicast() = default;
template<typename UT> // Explicit conversion to base type
constexpr multicast(const UT& value) explicit constexpr operator T() const
{ {
return Value;
} }
}; };