A few more meta programming bits.

Meta/is_streamable.h

@@ -0,0 +1,58 @@
+static_assert( __cplusplus > 201700, "C++17 Required" );
+
+#pragma once
+
+#include <Alepha/Alepha.h>
+
+#include <iosfwd>
+
+namespace Alepha::Hydrogen::Meta
+{
+	inline namespace exports { inline namespace type_traits {} }
+
+	namespace detail::type_traits::is_streamable
+	{
+		inline namespace exports {}
+
+		namespace impl
+		{
+			template< typename T, typename= void >
+			struct is_istreamable : std::false_type {};
+
+			template< typename T >
+			struct is_istreamable< T, std::void_t< decltype( std::declval< std::istream & >() >> std::declval< T & >() ) > > : std::true_type {};
+
+			template< typename T, typename= void >
+			struct is_ostreamable : std::false_type {};
+
+			template< typename T >
+			struct is_ostreamable< T, std::void_t< decltype( std::declval< std::ostream & >() << std::declval< T & >() ) > > : std::true_type {};
+		}
+
+		namespace exports
+		{
+			template< typename T >
+			constexpr bool is_istreamable_v= impl::is_istreamable< T >::value;
+
+			template< typename T >
+			constexpr bool is_ostreamable_v= impl::is_ostreamable< T >::value;
+
+			template< typename T >
+			constexpr bool is_streamable_v= is_istreamable_v< T > and is_ostreamable_v< T >;
+
+			template< typename T >
+			struct is_istreamable : std::bool_constant< is_istreamable_v< T > > {};
+
+			template< typename T >
+			struct is_ostreamable : std::bool_constant< is_ostreamable_v< T > > {};
+
+			template< typename T >
+			struct is_streamable : std::bool_constant< is_streamable_v< T > > {};
+		}
+	}
+
+	namespace exports::type_traits
+	{
+		using namespace detail::type_traits::is_streamable::exports;
+	}
+}