| 
 |  | 
| New to current users of | ||
|---|---|---|
| Feature | SCO OpenServer | UnixWare | 
| (high-performance) exception handling | yes | yes | 
| namespaces | yes | yes | 
| runtime type identification (RTTI) | yes | yes | 
| new-style casts | yes | yes | 
| array new/delete, nothrow new | yes | yes | 
| bool | yes | yes | 
| wchar_t | yes | yes | 
| mutable keyword | yes | yes | 
| static member constants | yes | yes | 
| default template arguments | yes | yes | 
| template instantiation directive | yes | yes | 
| typename keyword | yes | yes | 
| long long | yes | yes | 
| NCEG relational operators | yes | yes | 
| improved compile- and link-time performance | yes | yes | 
| better debugging (DWARF II, code in headers) | yes | yes | 
| CC -Tprelink_objects | yes | yes | 
| iostreams support for: | ||
| - long long | yes | yes | 
| - signed char | yes | yes | 
| - bool | yes | yes | 
| - long double | yes | no | 
| parts of Standard library Clause 18 (Language Support): | ||
| - dynamic memory management | yes | yes | 
| - type identification | yes | yes | 
| - exception handling | yes | yes | 
| - start/termination part of (exit, atexit, abort) | yes | yes | 
| all of Standard library Clause 19 (Diagnostics) | yes | yes | 
| member templates | yes | yes | 
| template specialization syntax | yes | yes | 
| for loop variable scope change | yes | yes | 
| explicit keyword | yes | yes | 
| extern inline | yes | yes | 
| full linkage specifications | yes | yes | 
| Standard Components: | ||
| - time class beyond year 2038 | yes | yes | 
| - namespaces | yes | yes | 
| - improved fs memory analysis tool | yes | yes | 
| partial specialization for class templates | yes | yes | 
| partial ordering of function templates | yes | yes | 
| covariant return types | yes | yes | 
| libC as a dynamic library (.so) | yes | yes | 
| thread safety in compiler and runtime | yes | yes | 
| digraphs | yes | no | 
| operator keywords | yes | no | 
| language clarifications | yes | no | 
| new template instantiation | yes | no | 
| precompiled headers | yes | no | 
| enhanced asms, pragmas | yes | no | 
| Pentium and Pentium Pro code generation | yes | no | 
| Standard Components classes | yes | no | 
| $ as identifier character option | yes | yes |