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Oracle Solaris Studio 12.3: C++ User's Guide     Oracle Solaris Studio 12.3 Information Library
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Document Information


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



4.6 Using an enum Name as a Scope Qualifier

Because an enum declaration does not introduce a scope, an enum name cannot be used as a scope qualifier. For example, the following code is invalid.

enum E {e1, e2, e3};
int i = E::e1; // invalid: E is not a scope name

To compile this invalid code, use the -features=extensions option. The -features=extensions option instructs the compiler to ignore a scope qualifier if it is the name of an enum type.

To make the code valid, remove the invalid qualifier E::.

Note - Use of this option increases the possibility of typographical errors yielding incorrect programs that compile without error messages.