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Oracle Solaris Studio 12.3: C++ User's Guide     Oracle Solaris Studio 12.3 Information Library
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Part I C++ Compiler

1.  The C++ Compiler

2.  Using the C++ Compiler

3.  Using the C++ Compiler Options

Part II Writing C++ Programs

4.  Language Extensions

4.1 Linker Scoping

4.1.1 Compatibility with Microsoft Windows

4.2 Thread-Local Storage

4.3 Overriding With Less Restrictive Virtual Functions

4.4 Making Forward Declarations of enum Types and Variables

4.5 Using Incomplete enum Types

4.6 Using an enum Name as a Scope Qualifier

4.7 Using Anonymous struct Declarations

4.8 Passing the Address of an Anonymous Class Instance

4.9 Declaring a Static Namespace-Scope Function as a Class Friend

4.10 Using the Predefined __func__ Symbol for Function Name

4.11 Supported Attributes

4.11.1 __packed__ Attribute Details

4.12 Compiler Support for Intel MMX and Extended x86 Platform Intrinsics

5.  Program Organization

6.  Creating and Using Templates

7.  Compiling Templates

8.  Exception Handling

9.  Improving Program Performance

10.  Building Multithreaded Programs

Part III Libraries

11.  Using Libraries

12.  Using the C++ Standard Library

13.  Using the Classic iostream Library

14.  Building Libraries

Part IV Appendixes

A.  C++ Compiler Options

B.  Pragmas



4.3 Overriding With Less Restrictive Virtual Functions

The C++ standard says that an overriding virtual function must not be less restrictive in the exceptions it allows than any function it overrides. It can have the same restrictions or be more restrictive. Note that the absence of an exception specification allows any exception.

Suppose, for example, that you call a function through a pointer to a base class. If the function has an exception specification, you can count on no other exceptions being thrown. If the overriding function has a less-restrictive specification, an unexpected exception could be thrown, which can result in unexpected program behavior followed by a program abort.

When you use -features=extensions, the compiler will allow overriding functions with less-restrictive exception specifications.