Author: sebor
Date: Fri Sep 26 08:54:34 2008
New Revision: 699379
URL: http://svn.apache.org/viewvc?rev=699379&view=rev
Log:
2008-09-26 Martin Sebor <[EMAIL PROTECTED]>
* examples/manual/binders.cpp (main): Constified locals and made
output more interesting. Exited with a non-zero status on failure.
* examples/manual/out/binders.out: Updated accordingly.
Modified:
stdcxx/branches/4.2.x/examples/manual/binders.cpp
stdcxx/branches/4.2.x/examples/manual/out/binders.out
Modified: stdcxx/branches/4.2.x/examples/manual/binders.cpp
URL:
http://svn.apache.org/viewvc/stdcxx/branches/4.2.x/examples/manual/binders.cpp?rev=699379&r1=699378&r2=699379&view=diff
==============================================================================
--- stdcxx/branches/4.2.x/examples/manual/binders.cpp (original)
+++ stdcxx/branches/4.2.x/examples/manual/binders.cpp Fri Sep 26 08:54:34 2008
@@ -22,13 +22,14 @@
* implied. See the License for the specific language governing
* permissions and limitations under the License.
*
- * Copyright 1994-2006 Rogue Wave Software.
+ * Copyright 1994-2006 Rogue Wave Software, Inc.
*
**************************************************************************/
#include <algorithm> // for find_if
#include <functional> // for equal_to, bind1st, bind2nd
-#include <iostream> // for cout, endl
+#include <iostream> // for cout
+#include <iterator> // for ostream_iterator
#include <vector> // for vector
#include <examples.h>
@@ -36,35 +37,50 @@
int main ()
{
- typedef std::vector<int, std::allocator<int> > Vector;
- typedef std::equal_to<Vector::value_type> equal_to;
+ typedef std::vector<int> Vector;
+ typedef std::equal_to<Vector::value_type> EqualTo;
- const Vector::value_type arr [] = { 1, 2, 3, 4 };
+ const Vector::value_type arr [] = { 1, 2, 3, 4, 5 };
- // Set up a vector.
- Vector v1 (arr + 0, arr + sizeof arr / sizeof *arr);
+ // Initialize a vector with the array elements.
+ const Vector v1 (arr, arr + sizeof arr / sizeof *arr);
- // Create an 'equal to 3' unary predicate by binding 3 to
- // the equal_to binary predicate.
- std::binder1st<equal_to> equal_to_3 = std::bind1st (equal_to (), 3);
+ // Value to look for.
+ const Vector::value_type x (3);
+
+ // Create an 'equal to 3' unary predicate by binding the value
+ // 3 to the EqualTo binary predicate.
+ const std::binder1st<EqualTo> equal_to_3 (std::bind1st (EqualTo (), x));
// Now use this new predicate in a call to find_if.
- Vector::iterator it1 = std::find_if (v1.begin (), v1.end (),
- equal_to_3);
+ const Vector::const_iterator it1 =
+ std::find_if (v1.begin (), v1.end (), equal_to_3);
// Even better, construct the new predicate on the fly.
- Vector::iterator it2 =
- std::find_if (v1.begin (), v1.end (),
- std::bind1st (equal_to (), 3));
+ const Vector::const_iterator it2 =
+ std::find_if (v1.begin (), v1.end (), std::bind1st (EqualTo (), x));
// And now the same thing using bind2nd.
- // Same result since equal_to is commutative.
- Vector::iterator it3 =
- std::find_if (v1.begin (), v1.end (),
- std::bind2nd (equal_to (), 3));
+ // Same result since EqualTo is commutative.
+ const Vector::const_iterator it3 =
+ std::find_if (v1.begin (), v1.end (), std::bind2nd (EqualTo (), x));
+
+ // Use the same predicate to count the number of elements
+ // equal to 3.
+ const Vector::size_type n =
+ std::count_if (v1.begin (), v1.end (), std::bind2nd (EqualTo (), x));
// Output results.
- std::cout << *it1 << " " << *it2 << " " << *it3 << '\n';
+ std::ostream_iterator<Vector::value_type> out (std::cout, " ");
+
+ std::cout << "The vector { ";
+ std::copy (v1.begin (), v1.end (), out);
+
+ std::cout << "} contains " << n << " element equal to " << x
+ << " at offset " << it1 - v1.begin () << ".\n";
+
+ // Exit with status of 0 on success, 1 on failure.
+ const bool success = 1 == n && it1 == it2 && it1 == it2 && *it1 == x;
- return 0;
+ return success ? 0 : 1;
}
Modified: stdcxx/branches/4.2.x/examples/manual/out/binders.out
URL:
http://svn.apache.org/viewvc/stdcxx/branches/4.2.x/examples/manual/out/binders.out?rev=699379&r1=699378&r2=699379&view=diff
==============================================================================
--- stdcxx/branches/4.2.x/examples/manual/out/binders.out (original)
+++ stdcxx/branches/4.2.x/examples/manual/out/binders.out Fri Sep 26 08:54:34
2008
@@ -1 +1 @@
-3 3 3
+The vector { 1 2 3 4 5 } contains 1 element equal to 3 at offset 2.
