Replace std::unary_function<> with std::function<>

[ClausKlein]

(deprecated in C++11) and removed in C++17

[ClausKlein]

Only in this sources auto_ptr is still used:

bash-3.2$ grep -rw --color auto_ptr */examples
ACE/examples/Smart_Pointers/Widget_Impl.h:  /// - We cannot use auto_ptr to manage the objects, since auto_ptr does not
ACE/examples/Web_Crawler/URL_Visitor.h: * This class is similar to an auto_ptr<> and should be used to
ACE/examples/Reactor/WFMO_Reactor/Window_Messages.cpp:  auto_ptr<ACE_Reactor> reactor (new ACE_Reactor (impl, 1));
ACE/examples/Reactor/WFMO_Reactor/Handle_Close.cpp:  auto_ptr<ACE_Reactor> reactor (create_reactor ());
ACE/examples/Reactor/TP_Reactor/client.cpp:    // put someData in a kind of auto_ptr so it gets deleted automatically
TAO/examples/Load_Balancing/Load_Balancer_i.cpp:      // Temporarily put the servant into the auto_ptr.
TAO/examples/Borland/ChatClientWnd.h:  auto_ptr<TORBThread> orb_thread_;
TAO/examples/Borland/ChatClientWnd.cpp:  auto_ptr<TStringList> ior (new TStringList);
bash-3.2$ 

[ClausKlein]

On my iMAC with current OSX and clang++16:

clang++ -Wnon-virtual-dtor -std=c++20 -std=c++20 -g -m64 -Wall -Wextra -Wpointer-arith -DACE_HAS_CUSTOM_EXPORT_MACROS=0   -I/Users/clausklein/Workspace/cpp/ACE_TAO/ACE -D__ACE_INLINE__ -I.. -DACE_HAS_IPV6 -DACE_HAS_VERSIONED_NAMESPACE=1 -DACE_BUILD_DLL  -c  -o .shobj/Argv_Type_Converter.o /Users/clausklein/Workspace/cpp/ACE_TAO/ACE/ace/Argv_Type_Converter.cpp
In file included from /Users/clausklein/Workspace/cpp/ACE_TAO/ACE/ace/ACE.cpp:5:
/Users/clausklein/Workspace/cpp/ACE_TAO/ACE/ace/Auto_Ptr.h:73:12: error: no member named 'auto_ptr' in namespace 'std'
using std::auto_ptr; // FIXME(CK): This does NOT compile with c++17 or newer!!!
      ~~~~~^
In file included from /Users/clausklein/Workspace/cpp/ACE_TAO/ACE/ace/Argv_Type_Converter.cpp:1:
In file included from /Users/clausklein/Workspace/cpp/ACE_TAO/ACE/ace/Argv_Type_Converter.h:17:
In file included from /Users/clausklein/Workspace/cpp/ACE_TAO/ACE/ace/OS_Memory.h:152:
In file included from /Users/clausklein/Workspace/cpp/ACE_TAO/ACE/ace/OS_NS_stdlib.h:452:
/Users/clausklein/Workspace/cpp/ACE_TAO/ACE/ace/OS_NS_stdlib.inl:265:12: warning: 'mktemp' is deprecated: This function is provided for compatibility reasons only.  Due to security concerns inherent in the design of mktemp(3), it is highly recommended that you use mkstemp(3) instead. [-Wdeprecated-declarations]
  return ::mktemp (s);
           ^
/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/usr/include/stdlib.h:210:1: note: 'mktemp' has been explicitly marked deprecated here
__deprecated_msg("This function is provided for compatibility reasons only.  Due to security concerns inherent in the design of mktemp(3), it is highly recommended that you use mkstemp(3) instead.")
^
/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/usr/include/sys/cdefs.h:215:48: note: expanded from macro '__deprecated_msg'
        #define __deprecated_msg(_msg) __attribute__((__deprecated__(_msg)))
                                                      ^
In file included from /Users/clausklein/Workspace/cpp/ACE_TAO/ACE/ace/Argv_Type_Converter.cpp:1:
In file included from /Users/clausklein/Workspace/cpp/ACE_TAO/ACE/ace/Argv_Type_Converter.h:17:
In file included from /Users/clausklein/Workspace/cpp/ACE_TAO/ACE/ace/OS_Memory.h:152:
In file included from /Users/clausklein/Workspace/cpp/ACE_TAO/ACE/ace/OS_NS_stdlib.h:452:
/Users/clausklein/Workspace/cpp/ACE_TAO/ACE/ace/OS_NS_stdlib.inl:280:9: warning: 'mktemp' is deprecated: This function is provided for compatibility reasons only.  Due to security concerns inherent in the design of mktemp(3), it is highly recommended that you use mkstemp(3) instead. [-Wdeprecated-declarations]
  if (::mktemp (narrow_s.char_rep ()) == 0)
        ^
/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/usr/include/stdlib.h:210:1: note: 'mktemp' has been explicitly marked deprecated here
__deprecated_msg("This function is provided for compatibility reasons only.  Due to security concerns inherent in the design of mktemp(3), it is highly recommended that you use mkstemp(3) instead.")
^
/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/usr/include/sys/cdefs.h:215:48: note: expanded from macro '__deprecated_msg'
        #define __deprecated_msg(_msg) __attribute__((__deprecated__(_msg)))
                                                      ^
3 warnings and 1 error generated.
make[1]: *** [.shobj/ACE.o] Error 1
make[1]: *** Waiting for unfinished jobs....
2 warnings generated.
3 warnings generated.
3 warnings generated.
3 warnings generated.
3 warnings generated.
make: *** [ACE] Error 2
bash-3.2$ 

[jwillemsen]

See #2109