1 files changed, 71 insertions, 0 deletions
diff --git a/ml/dlib/examples/thread_function_ex.cpp b/ml/dlib/examples/thread_function_ex.cpp
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+++ b/ml/dlib/examples/thread_function_ex.cpp
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+// The contents of this file are in the public domain. See LICENSE_FOR_EXAMPLE_PROGRAMS.txt
+/*
+    This is a very simple example that illustrates the use of the
+    thread_function object from the dlib C++ Library.
+
+    The output of the programs should look like this:
+
+        45.6
+        9.999
+        I have no args!
+        val: 3
+*/
+
+
+#include <iostream>
+#include <dlib/threads.h>
+#include <dlib/ref.h>
+
+using namespace dlib;
+using namespace std;
+
+void thread_1(double a)
+{
+    cout << a << endl;
+}
+
+void thread_2 ()
+{
+    cout << "I have no args!" << endl;
+}
+
+void thread_increment(double& a)
+{
+    a += 1;
+}
+
+int main()
+{
+    // create a thread that will call thread_1(45.6)
+    thread_function t1(thread_1,45.6);
+    // wait for the t1 thread to end
+    t1.wait();
+
+
+    // create a thread that will call thread_1(9.999)
+    thread_function t2(thread_1,9.999);
+    // wait for the t2 thread to end
+    t2.wait();
+
+
+    // create a thread that will call thread_2()
+    thread_function t3(thread_2);
+
+
+    // Note that we can also use the ref() function to pass a variable
+    // to a thread by reference.  For example, the thread below adds
+    // one to val.
+    double val = 2;
+    thread_function t4(thread_increment, dlib::ref(val));
+    t4.wait(); // wait for t4 to finish before printing val.
+    // Print val.  It will now have a value of 3.
+    cout << "val: " << val << endl;
+
+
+
+    // At this point we will automatically wait for t3 to end because
+    // the destructor for thread_function objects always wait for their
+    // thread to terminate.
+}
+
+