diff options
Diffstat (limited to 'indra/llcommon/llstl.h')
| -rw-r--r-- | indra/llcommon/llstl.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/indra/llcommon/llstl.h b/indra/llcommon/llstl.h index 8ad12c9a03..d3941e1bc9 100644 --- a/indra/llcommon/llstl.h +++ b/indra/llcommon/llstl.h @@ -33,6 +33,7 @@ #include <vector> #include <set> #include <deque> +#include <typeinfo> // Use to compare the first element only of a pair // e.g. typedef std::set<std::pair<int, Data*>, compare_pair<int, Data*> > some_pair_set_t; @@ -470,4 +471,54 @@ llbind2nd(const _Operation& __oper, const _Tp& __x) return llbinder2nd<_Operation>(__oper, _Arg2_type(__x)); } +/** + * Compare std::type_info* pointers a la std::less. We break this out as a + * separate function for use in two different std::less specializations. + */ +inline +bool before(const std::type_info* lhs, const std::type_info* rhs) +{ +#if LL_LINUX && defined(__GNUC__) && ((__GNUC__ < 4) || (__GNUC__ == 4 && __GNUC_MINOR__ < 4)) + // If we're building on Linux with gcc, and it's either gcc 3.x or + // 4.{0,1,2,3}, then we have to use a workaround. Note that we use gcc on + // Mac too, and some people build with gcc on Windows (cygwin or mingw). + // On Linux, different load modules may produce different type_info* + // pointers for the same type. Have to compare name strings to get good + // results. + return strcmp(lhs->name(), rhs->name()) < 0; +#else // not Linux, or gcc 4.4+ + // Just use before(), as we normally would + return lhs->before(*rhs); +#endif +} + +/** + * Specialize std::less<std::type_info*> to use std::type_info::before(). + * See MAINT-1175. It is NEVER a good idea to directly compare std::type_info* + * because, on Linux, you might get different std::type_info* pointers for the + * same type (from different load modules)! + */ +namespace std +{ + template <> + struct less<const std::type_info*>: + public std::binary_function<const std::type_info*, const std::type_info*, bool> + { + bool operator()(const std::type_info* lhs, const std::type_info* rhs) const + { + return before(lhs, rhs); + } + }; + + template <> + struct less<std::type_info*>: + public std::binary_function<std::type_info*, std::type_info*, bool> + { + bool operator()(std::type_info* lhs, std::type_info* rhs) const + { + return before(lhs, rhs); + } + }; +} // std + #endif // LL_LLSTL_H |