diff options
Diffstat (limited to 'libstdc++-v3/libsupc++/typeinfo')
| -rw-r--r-- | libstdc++-v3/libsupc++/typeinfo | 57 |
1 files changed, 25 insertions, 32 deletions
diff --git a/libstdc++-v3/libsupc++/typeinfo b/libstdc++-v3/libsupc++/typeinfo index 949c6d81e2f..6cabf7508eb 100644 --- a/libstdc++-v3/libsupc++/typeinfo +++ b/libstdc++-v3/libsupc++/typeinfo @@ -1,6 +1,6 @@ // RTTI support for -*- C++ -*- -// Copyright (C) 1994, 1995, 1996, 1997, 1998, 2000 Free Software Foundation - +// Copyright (C) 1994, 1995, 1996, 1997, 1998, 2000, 2001 Free Software Foundation +// // This file is part of GNU CC. // // GNU CC is free software; you can redistribute it and/or modify @@ -27,53 +27,46 @@ // invalidate any other reasons why the executable file might be covered by // the GNU General Public License. -// __GXX_ABI_VERSION distinguishes the ABI that is being used. Values <100 -// indicate the `old' abi, which grew as C++ was defined. Values >=100 -// indicate the `new' abi, which is a cross vendor C++ abi, documented at -// `http://reality.sgi.com/dehnert_engr/cxx/'. +/** @file typeinfo + * This header provides RTTI support. + */ #ifndef __TYPEINFO__ #define __TYPEINFO__ -#pragma interface "typeinfo" - #include <exception> extern "C++" { -#if defined(__GXX_ABI_VERSION) && __GXX_ABI_VERSION >= 100 namespace __cxxabiv1 { class __class_type_info; } // namespace __cxxabiv1 -#endif - -#if !defined(__GXX_ABI_VERSION) || __GXX_ABI_VERSION < 100 - // In the old ABI, typeinfo name strings were not merged. - #define __GXX_MERGED_TYPEINFO_NAMES 0 -#elif !__GXX_WEAK__ - // If weak symbols are not supported, they are still not merged. +#if !__GXX_WEAK__ + // If weak symbols are not supported, typeinfo names are not merged. #define __GXX_MERGED_TYPEINFO_NAMES 0 #else - // In the new ABI, on platforms that support weak symbols, they are - // merged. + // On platforms that support weak symbols, typeinfo names are merged. #define __GXX_MERGED_TYPEINFO_NAMES 1 #endif namespace std { + /** The @c type_info class describes type information generated by + * an implementation. + * @brief Used in RTTI. */ class type_info { public: - // Destructor. Being the first non-inline virtual function, this - // controls in which translation unit the vtable is emitted. The - // compiler makes use of that information to know where to emit - // the runtime-mandated type_info structures in the new-abi. + /** Destructor. Being the first non-inline virtual function, this + * controls in which translation unit the vtable is emitted. The + * compiler makes use of that information to know where to emit + * the runtime-mandated type_info structures in the new-abi. */ virtual ~type_info(); private: - // Assigning type_info is not supported. made private. + /// Assigning type_info is not supported. Made private. type_info& operator=(const type_info&); type_info(const type_info&); @@ -85,13 +78,10 @@ namespace std public: // the public interface -#if !defined(__GXX_ABI_VERSION) || __GXX_ABI_VERSION < 100 + /** Returns an \e implementation-defined byte string; this is not + * portable between compilers! */ const char* name() const { return __name; } -#else - const char* name() const - { return __name; } -#endif #if !__GXX_MERGED_TYPEINFO_NAMES bool before(const type_info& arg) const; @@ -100,6 +90,8 @@ namespace std // type. Uniqueness must use the _name value, not object address. bool operator==(const type_info& __arg) const; #else + /** Returns true if @c *this preceeds @c __arg in the implementation's + * collation order. */ // In new abi we can rely on type_info's NTBS being unique, // and therefore address comparisons are sufficient. bool before(const type_info& __arg) const @@ -111,7 +103,6 @@ namespace std { return !operator==(__arg); } // the internal interface -#if defined(__GXX_ABI_VERSION) && __GXX_ABI_VERSION >= 100 public: // return true if this is a pointer type of some kind virtual bool __is_pointer_p() const; @@ -130,21 +121,23 @@ namespace std // internally used during catch matching virtual bool __do_upcast(const __cxxabiv1::__class_type_info *__target, void **__obj_ptr) const; -#endif }; + /** If you attempt an invalid @c dynamic_cast expression, an instance of + * this class (or something derived from this class) is thrown. */ class bad_cast : public exception { public: bad_cast() throw() { } - virtual ~bad_cast() throw() { } + virtual ~bad_cast() throw(); }; + /** If you use a NULL pointer in a @c typeid expression, this is thrown. */ class bad_typeid : public exception { public: bad_typeid () throw() { } - virtual ~bad_typeid () throw() { } + virtual ~bad_typeid () throw(); }; } // namespace std |