shorten extended variant definition

alib2std/src/extensions/container/variant.hpp

@@ -64,38 +64,6 @@ struct variant_builder_impl < std::variant < ResTs ... > > : public std::variant
 	 * Inherit constructors of the standard variant
 	 */
 	using std::variant < ResTs ... >::variant;
-
-	/**
-	 * Inherit operator = of the standard variant
-	 */
-	using std::variant < ResTs ... >::operator=;
-#ifndef __clang__
-
-	/**
-	 * Default constructor needed by g++ since it is not inherited
-	 */
-	variant_builder_impl ( ) = default;
-
-	/**
-	 * Copy constructor needed by g++ since it is not inherited
-	 */
-	variant_builder_impl ( const variant_builder_impl & other ) = default;
-
-	/**
-	 * Move constructor needed by g++ since it is not inherited
-	 */
-	variant_builder_impl ( variant_builder_impl && other ) = default;
-
-	/**
-	 * Copy operator = needed by g++ since it is not inherited
-	 */
-	variant_builder_impl & operator = ( variant_builder_impl && other ) = default;
-
-	/**
-	 * Move operator = needed by g++ since it is not inherited
-	 */
-	variant_builder_impl & operator = ( const variant_builder_impl & other ) = default;
-#endif
 };
 /**
@@ -112,38 +80,6 @@ struct variant_builder_impl < std::variant < ResTs ... >, T, Ts ... > : public v
 	 * Inherit constructors of the standard variant
 	 */
 	using variant_builder_impl < typename std::conditional < is_in < T, ResTs ... >::value, std::variant < ResTs ... >, std::variant < ResTs ..., T > >::type, Ts ... >::variant_builder_impl;
-
-	/**
-	 * Inherit operator = of the standard variant
-	 */
-	using variant_builder_impl < typename std::conditional < is_in < T, ResTs ... >::value, std::variant < ResTs ... >, std::variant < ResTs ..., T > >::type, Ts ... >::operator =;
-#ifndef __clang__
-
-	/**
-	 * Default constructor needed by g++ since it is not inherited
-	 */
-	variant_builder_impl ( ) = default;
-
-	/**
-	 * Copy constructor needed by g++ since it is not inherited
-	 */
-	variant_builder_impl ( const variant_builder_impl & other ) = default;
-
-	/**
-	 * Move constructor needed by g++ since it is not inherited
-	 */
-	variant_builder_impl ( variant_builder_impl && other ) = default;
-
-	/**
-	 * Copy operator = needed by g++ since it is not inherited
-	 */
-	variant_builder_impl & operator = ( variant_builder_impl && other ) = default;
-
-	/**
-	 * Move operator = needed by g++ since it is not inherited
-	 */
-	variant_builder_impl & operator = ( const variant_builder_impl & other ) = default;
-#endif
 };
 template < class T, class ... Ts >
@@ -152,38 +88,6 @@ struct variant_builder_start : public variant_builder_impl < std::variant < T >,
 	 * Inherit constructors of the standard variant
 	 */
 	using variant_builder_impl < std::variant < T >, Ts ... >::variant_builder_impl;
-
-	/**
-	 * Inherit operator = of the standard variant
-	 */
-	using variant_builder_impl < std::variant < T >, Ts ... >::operator =;
-#ifndef __clang__
-
-	/**
-	 * Default constructor needed by g++ since it is not inherited
-	 */
-	variant_builder_start ( ) = default;
-
-	/**
-	 * Copy constructor needed by g++ since it is not inherited
-	 */
-	variant_builder_start ( const variant_builder_start & other ) = default;
-
-	/**
-	 * Move constructor needed by g++ since it is not inherited
-	 */
-	variant_builder_start ( variant_builder_start && other ) = default;
-
-	/**
-	 * Copy operator = needed by g++ since it is not inherited
-	 */
-	variant_builder_start & operator = ( variant_builder_start && other ) = default;
-
-	/**
-	 * Move operator = needed by g++ since it is not inherited
-	 */
-	variant_builder_start & operator = ( const variant_builder_start & other ) = default;
-#endif
 };
 /**
@@ -302,7 +206,7 @@ public:
 	/**
 	 * Inherit operator = of the standard variant
 	 */
-	using variant_builder_start < Ts ... >::operator =;
+	using variant_builder_start < Ts ... >::__std__variant::operator=;
 #ifndef __clang__
 	/**