remove not needed virtual method declaration

alib2abstraction/src/abstraction/ValueProvider.hpp

@@ -46,8 +46,6 @@ public:
 				throw std::domain_error ( "Value not copy constructible" );
 		}
 	}
-
-	virtual bool eval ( ) = 0;
 };
 template < class Type >
@@ -66,8 +64,6 @@ public:
 	Type & getValue ( bool ) const {
 		return getData ( );
 	}
-
-	virtual bool eval ( ) = 0;
 };
 template < class Type >
@@ -86,8 +82,6 @@ public:
 	const Type & getValue ( bool ) const {
 		return getConstData ( );
 	}
-
-	virtual bool eval ( ) = 0;
 };
 template < class Type >
@@ -109,8 +103,6 @@ public:
 		else
 			throw std::domain_error ( "Value not copy constructible" );
 	}
-
-	virtual bool eval ( ) = 0;
 };
 template < class Type >
@@ -132,8 +124,6 @@ public:
 		else
 			throw std::domain_error ( "Value not copy constructible" );
 	}
-
-	virtual bool eval ( ) = 0;
 };
 } /* namespace abstraction */