Added several samples for make and assign

[SVN r69126]

doc/src/examples/algorithms/make_2d_point.cpp

@@ -0,0 +1,61 @@
+// Boost.Geometry (aka GGL, Generic Geometry Library)
+//
+// Copyright Barend Gehrels 2011, Geodan, Amsterdam, the Netherlands
+// Use, modification and distribution is subject to the Boost Software License,
+// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// Quickbook Example
+
+//[make_2d_point
+//` Shows the usage of make as a generic constructor for different point types
+
+#include <iostream>
+
+#include <boost/geometry/geometry.hpp>
+#include <boost/geometry/geometries/geometries.hpp>
+#include <boost/geometry/geometries/register/point.hpp>
+#include <boost/geometry/geometries/adapted/tuple_cartesian.hpp>
+#include <boost/geometry/geometries/adapted/boost_polygon/point.hpp>
+
+struct mypoint { float _x, _y; };
+
+BOOST_GEOMETRY_REGISTER_POINT_2D(mypoint, float, cs::cartesian, _x, _y)
+
+template <typename Point>
+void construct_and_display()
+{
+    using boost::geometry::make;
+    using boost::geometry::get;
+
+    Point p = make<Point>(1, 2);
+
+    std::cout << "x=" << get<0>(p) << " y=" << get<1>(p)
+        << " (" << typeid(Point).name() << ")"
+        << std::endl;
+}
+
+int main()
+{
+    construct_and_display<boost::geometry::model::d2::point_xy<double> >();
+    construct_and_display<boost::geometry::model::d2::point_xy<int> >();
+    construct_and_display<boost::tuple<double, double> >();
+    construct_and_display<boost::polygon::point_data<int> >();
+    construct_and_display<mypoint>();
+    return 0;
+}
+
+//]
+
+//[make_2d_point_output
+/*`
+Output (compiled using gcc):
+[pre
+x=1 y=2 (N5boost8geometry5model2d28point_xyIdNS0_2cs9cartesianEEE)
+x=1 y=2 (N5boost8geometry5model2d28point_xyIiNS0_2cs9cartesianEEE)
+x=1 y=2 (N5boost6tuples5tupleIddNS0_9null_typeES2_S2_S2_S2_S2_S2_S2_EE)
+x=1 y=2 (N5boost7polygon10point_dataIiEE)
+x=1 y=2 (7mypoint)
+]
+*/
+//]