Upgraded the thread_function object so that it is more general. It

can now call arbitrary function objects with up to 4 arguments.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%403134

dlib/threads/thread_function_extension.h

@@ -7,6 +7,7 @@
 #include "threads_kernel.h"
 #include "auto_mutex_extension.h"
 #include "threaded_object_extension.h"
+#include "../smart_pointers.h"
 
 namespace dlib
 {
@@ -20,90 +21,157 @@ namespace dlib
         {
         public:
             virtual void go() = 0;
-
             virtual ~base_funct() {}
         };
 
-        template <typename T>
-        class super_funct_arg : public base_funct
+        template <typename F, typename T1, typename T2, typename T3, typename T4>
+        class super_funct_4 : public base_funct
         {
         public:
-            super_funct_arg (
-                void (*funct)(T),
-                T arg
-            )
+            super_funct_4 ( F funct, T1 arg1, T2 arg2, T3 arg3, T4 arg4)
             {
-                a = arg;
+                a1 = arg1;
+                a2 = arg2;
+                a3 = arg3;
+                a4 = arg4;
                 f = funct;
             }
 
-            void go() { f(a); }
+            void go() { f(a1, a2, a3, a4); }
 
 
-            T a;
-            void (*f)(T);
+            T1 a1;
+            T2 a2;
+            T3 a3;
+            T4 a4;
+            F f;
         };
 
+        template <typename F, typename T1, typename T2, typename T3>
+        class super_funct_3 : public base_funct
+        {
+        public:
+            super_funct_3 ( F funct, T1 arg1, T2 arg2, T3 arg3)
+            {
+                a1 = arg1;
+                a2 = arg2;
+                a3 = arg3;
+                f = funct;
+            }
+
+            void go() { f(a1, a2, a3); }
 
-        class super_funct_no_arg : public base_funct
+
+            T1 a1;
+            T2 a2;
+            T3 a3;
+            F f;
+        };
+
+        template <typename F, typename T1, typename T2>
+        class super_funct_2 : public base_funct
         {
         public:
-            super_funct_no_arg (
-                void (*funct)()
-            )
+            super_funct_2 ( F funct, T1 arg1, T2 arg2)
             {
+                a1 = arg1;
+                a2 = arg2;
                 f = funct;
             }
 
-            void go() { f(); }
+            void go() { f(a1, a2); }
 
-            void (*f)();
 
+            T1 a1;
+            T2 a2;
+            F f;
         };
 
-        template <typename T>
-        class super_Tfunct_no_arg : public base_funct
+        template <typename F, typename T>
+        class super_funct_1 : public base_funct
         {
         public:
-            super_Tfunct_no_arg (
-                const T& funct
-            )
+            super_funct_1 ( F funct, T arg)
             {
+                a = arg;
                 f = funct;
             }
 
-            void go() { f(); }
+            void go() { f(a); }
+
+
+            T a;
+            F f;
+        };
+
+        template <typename F>
+        class super_funct_0 : public base_funct
+        {
+        public:
+            super_funct_0 ( F funct)
+            {
+                f = funct;
+            }
             
-            T f;
+            void go() { f(); }
 
+            F f;
         };
 
     public:
 
-        template <typename T>
+        template <typename F>
         thread_function (
-            const T& funct
+            F funct
         )
         {
-            f = new super_Tfunct_no_arg<T>(funct);
+            f.reset(new super_funct_0<F>(funct));
             start();
         }
 
+        template <typename F, typename T>
         thread_function (
-            void (*funct)()
+            F funct,
+            T arg
         )
         {
-            f = new super_funct_no_arg(funct);
+            f.reset(new super_funct_1<F,T>(funct,arg));
             start();
         }
 
-        template <typename T>
+        template <typename F, typename T1, typename T2>
         thread_function (
-            void (*funct)(T),
-            T arg
+            F funct,
+            T1 arg1,
+            T2 arg2
+        )
+        {
+            f.reset(new super_funct_2<F,T1,T2>(funct, arg1, arg2));
+            start();
+        }
+
+        template <typename F, typename T1, typename T2, typename T3>
+        thread_function (
+            F funct,
+            T1 arg1,
+            T2 arg2,
+            T3 arg3
+        )
+        {
+            f.reset(new super_funct_3<F,T1,T2,T3>(funct, arg1, arg2, arg3));
+            start();
+        }
+
+        template <typename F, typename T1, typename T2, typename T3, typename T4>
+        thread_function (
+            F funct,
+            T1 arg1,
+            T2 arg2,
+            T3 arg3,
+            T4 arg4
         )
         {
-            f = new super_funct_arg<T>(funct,arg);
+            f.reset(new super_funct_4<F,T1,T2,T3,T4>(funct, arg1, arg2, arg3, arg4));
             start();
         }
 
@@ -111,7 +179,6 @@ namespace dlib
         )
         {
             threaded_object::wait();
-            delete f;
         }
 
         bool is_alive (
@@ -133,7 +200,7 @@ namespace dlib
             f->go();
         }
 
-        base_funct* f;
+        scoped_ptr<base_funct> f;
 
         // restricted functions
         thread_function(thread_function&);        // copy constructor

dlib/threads/thread_function_extension_abstract.h

@@ -14,19 +14,19 @@ namespace dlib
     {
         /*!
             WHAT THIS OBJECT REPRESENTS
-                This object represents a thread on a global C++ function.  That is, 
-                it allows you to run a global function in its own thread.
+                This object represents a thread on a global C++ function or function
+                object.  That is, it allows you to run a function in its own thread.
         !*/
     public:
 
-        template <typename T>
+        template <typename F>
         thread_function (
-            const T& funct
+            F funct
         );
         /*!
             ensures
                 - #*this is properly initialized
-                - the function object funct has been started in its own thread
+                - the function funct has been started in its own thread
             throws
                 - std::bad_alloc
                 - dlib::thread_error
@@ -34,13 +34,15 @@ namespace dlib
                     gathering resources to create threading objects.
         !*/
 
+        template <typename F, typename T1>
         thread_function (
-            void (*funct)()
+            F funct,
+            T1 arg1
         );
         /*!
             ensures
                 - #*this is properly initialized
-                - the function pointed to by funct has been started in its own thread
+                - A thread has been created and it will call funct(arg1)
             throws
                 - std::bad_alloc
                 - dlib::thread_error
@@ -48,16 +50,53 @@ namespace dlib
                     gathering resources to create threading objects.
         !*/
 
-        template <typename T>
+        template <typename F, typename T1, typename T2>
         thread_function (
-            void (*funct)(T),
-            T arg
+            F funct,
+            T1 arg1,
+            T2 arg2
         );
         /*!
             ensures
                 - #*this is properly initialized
-                - the function pointed to by funct has been started in its own thread and
-                  passed the argument arg
+                - A thread has been created and it will call funct(arg1, arg2)
+            throws
+                - std::bad_alloc
+                - dlib::thread_error
+                    the constructor may throw this exception if there is a problem 
+                    gathering resources to create threading objects.
+        !*/
+
+        template <typename F, typename T1, typename T2, typename T3>
+        thread_function (
+            F funct,
+            T1 arg1,
+            T2 arg2,
+            T3 arg3
+        );
+        /*!
+            ensures
+                - #*this is properly initialized
+                - A thread has been created and it will call funct(arg1, arg2, arg3)
+            throws
+                - std::bad_alloc
+                - dlib::thread_error
+                    the constructor may throw this exception if there is a problem 
+                    gathering resources to create threading objects.
+        !*/
+
+        template <typename F, typename T1, typename T2, typename T3, typename T4>
+        thread_function (
+            F funct,
+            T1 arg1,
+            T2 arg2,
+            T3 arg3,
+            T4 arg4
+        );
+        /*!
+            ensures
+                - #*this is properly initialized
+                - A thread has been created and it will call funct(arg1, arg2, arg3, arg4)
             throws
                 - std::bad_alloc
                 - dlib::thread_error