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libs/range/test/algorithm_example.cpp

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+// Boost.Range library
+//
+//  Copyright Thorsten Ottosen 2003-2004. 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)
+//
+// For more information, see http://www.boost.org/libs/range/
+//
+
+#include <boost/detail/workaround.hpp>
+
+#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
+#  pragma warn -8091 // suppress warning in Boost.Test
+#  pragma warn -8057 // unused argument argc/argv in Boost.Test
+#endif
+
+#include <boost/range/functions.hpp>
+#include <boost/range/metafunctions.hpp>
+#include <boost/range/as_literal.hpp>
+#include <boost/test/test_tools.hpp>
+#include <iostream>
+#include <algorithm>
+#include <vector>
+#include <utility>
+
+namespace
+{
+    //
+    // example: extracting bounds in a generic algorithm
+    //
+    template< typename Range, typename T >
+    inline typename boost::range_iterator<Range>::type
+    find( Range& c, const T& value )
+    {
+       return std::find( boost::begin( c ), boost::end( c ), value );
+    }
+    
+    template< typename Range, typename T >
+    inline typename boost::range_iterator<Range>::type 
+    find( const Range& c, const T& value )
+    {
+       return std::find( boost::begin( c ), boost::end( c ), value );
+    }
+                   
+    // 
+    // replace first value and return its index
+    //                                
+    template< class Range, class T >
+    inline typename boost::range_difference<Range>::type
+    my_generic_replace( Range& c, const T& value, const T& replacement )
+    {
+       typename boost::range_iterator<Range>::type found = find( c, value );
+       
+       if( found != boost::end( c ) )
+           *found = replacement;
+       return std::distance( boost::begin( c ), found );
+    }                  
+}
+
+
+void check_algorithm()
+{
+    //
+    // usage
+    //
+    const int N = 5;                     
+    std::vector<int> my_vector;
+    int values[] = { 1,2,3,4,5,6,7,8,9 };
+    my_vector.assign( values, values + 9 );
+    typedef std::vector<int>::iterator iterator;
+    std::pair<iterator,iterator>       my_view( boost::begin( my_vector ), 
+                                                boost::begin( my_vector ) + N );
+    BOOST_CHECK_EQUAL( my_generic_replace( my_vector, 4, 2 ), 3 );
+    BOOST_CHECK_EQUAL( my_generic_replace( my_view, 4, 2 ), N );
+
+}
+
+#include <boost/test/unit_test.hpp>
+using boost::unit_test::test_suite;
+
+test_suite* init_unit_test_suite( int argc, char* argv[] )
+{
+    test_suite* test = BOOST_TEST_SUITE( "Range Test Suite" );
+
+    test->add( BOOST_TEST_CASE( &check_algorithm ) );
+
+    return test;
+}
+
+
+