lazily stringify expressions

include/internal/catch_assertionresult.hpp

@@ -72,7 +72,7 @@ namespace Catch {
     }
 
     std::string AssertionResult::getExpandedExpression() const {
-        return m_resultData.reconstructedExpression;
+        return m_resultData.reconstructExpression();
     }
 
     std::string AssertionResult::getMessage() const {
@@ -86,6 +86,14 @@ namespace Catch {
         return m_info.macroName;
     }
 
+    void AssertionResult::discardDecomposedExpression() const {
+        m_resultData.decomposedExpression = CATCH_NULL;
+    }
+
+    void AssertionResult::expandDecomposedExpression() const {
+        m_resultData.reconstructExpression();
+    }
+
 } // end namespace Catch
 
 #endif // TWOBLUECUBES_CATCH_ASSERTIONRESULT_HPP_INCLUDED