Added libksquirrel for KDE3

git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/libraries/libksquirrel@1095624 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

5 files changed, 99 insertions, 0 deletions

diff --git a/doc/sources/c++/README b/doc/sources/c++/README
new file mode 100644
index 0000000..189ebab
--- /dev/null
+++ b/doc/sources/c++/README
@@ -0,0 +1,3 @@
+Originally written by Aaron Isotton.
+Look for article "C++ dlopen mini HOWTO" in internet or
+visit http://ksquirrel.sf.net/ksquirrel-libs-olibs2.php
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diff --git a/doc/sources/c++/compile b/doc/sources/c++/compile
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index 0000000..64687fa
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+++ b/doc/sources/c++/compile
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+#!/bin/sh
+
+g++ -O2 -Wall -fPIC -c triangle.cpp
+g++ -shared -o triangle.so triangle.o
+g++ -o test main.cpp -ldl
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diff --git a/doc/sources/c++/main.cpp b/doc/sources/c++/main.cpp
new file mode 100644
index 0000000..b8fb8cd
--- /dev/null
+++ b/doc/sources/c++/main.cpp
@@ -0,0 +1,44 @@
+#include "polygon.hpp"
+
+#include <iostream>
+#include <dlfcn.h>
+
+int main()
+{
+    using std::cout;
+    using std::cerr;
+
+    // load the triangle library
+    void* triangle = dlopen("./triangle.so", RTLD_LAZY);
+    
+    if (!triangle)
+    {
+        cerr << "Cannot load library: " << dlerror() << '\n';
+        return 1;
+    }
+
+    // load the symbols
+    create_t* create_triangle = (create_t*) dlsym(triangle, "create");
+    destroy_t* destroy_triangle = (destroy_t*) dlsym(triangle, "destroy");
+    
+    if (!create_triangle || !destroy_triangle)
+    {
+        cerr << "Cannot load symbols: " << dlerror() << '\n';
+        return 1;
+    }
+
+    // create an instance of the class
+    polygon* poly = create_triangle();
+
+    // use the class
+    poly->set_side_length(7);
+        cout << "The area is: " << poly->area() << '\n';
+
+    // destroy the class
+    destroy_triangle(poly);
+
+    // unload the triangle library
+    dlclose(triangle);
+    
+    return 0;
+}
diff --git a/doc/sources/c++/polygon.hpp b/doc/sources/c++/polygon.hpp
new file mode 100644
index 0000000..e3189bf
--- /dev/null
+++ b/doc/sources/c++/polygon.hpp
@@ -0,0 +1,25 @@
+#ifndef POLYGON_HPP
+#define POLYGON_HPP
+
+class polygon
+{
+	protected:
+		double side_length_;
+
+	public:
+		polygon() : side_length_(0)
+		{}
+
+		void set_side_length(double side_length)
+		{
+			side_length_ = side_length;
+		}
+
+		virtual double area() const = 0;
+};
+
+// the types of the class factories
+typedef polygon* create_t();
+typedef void destroy_t(polygon*);
+
+#endif
diff --git a/doc/sources/c++/triangle.cpp b/doc/sources/c++/triangle.cpp
new file mode 100644
index 0000000..96185d0
--- /dev/null
+++ b/doc/sources/c++/triangle.cpp
@@ -0,0 +1,22 @@
+#include "polygon.hpp"
+#include <cmath>
+
+class triangle : public polygon
+{
+	public:
+		virtual double area() const
+		{
+			return side_length_ * side_length_ * sqrt(3) / 2;
+		}
+};
+
+// the class factories
+extern "C" polygon* create()
+{
+    return new triangle;
+}
+
+extern "C" void destroy(polygon* p)
+{
+    delete p;
+}