text: /* <stig/expr/util.h> 
  
     TODO
  
     Copyright 2010-2014 Tagged
     
     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at
     
       http://www.apache.org/licenses/LICENSE-2.0
     
     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License. */
  
  #pragma once
  
  namespace Stig {
  
    namespace Expr {
  
      template <typename TFinal>
      const TFinal *TExpr::As() const {
        static_assert(std::is_base_of<TExpr, TFinal>::value, "TExpr::As<>() can only be used with final types");
        assert(this);
        auto result = TryAs<TFinal>();
        assert(result);
        return result;
      }
  
      template <typename TFinal>
      bool TExpr::Is() const {
        static_assert(std::is_base_of<TExpr, TFinal>::value, "TExpr::Is<>() can only be used with final types");
        assert(this);
        return TryAs<TFinal>();
      }
  
      template <typename TFinal>
      const TFinal *TExpr::TryAs() const {
        static_assert(std::is_base_of<TExpr, TFinal>::value, "TExpr::TryAs<>() can only be used with final types");
        assert(this);
        return dynamic_cast<const TFinal *>(this);
      }
  
    } // Expr
  
  } // Stig
  