add container transformation function

alib2std/src/algorithm

@@ -2,6 +2,7 @@
 #define __ALGORITHM_HEADER_WRAPPER_
 #include <bits/../algorithm>
+#include <functional>
 #include "extensions/algorithm.hpp"
 #endif /* __ALGORITHM_HEADER_WRAPPER_ */

alib2std/src/extensions/algorithm.hpp

@@ -29,6 +29,13 @@ bool excludes(InputIt1 first1, InputIt1 last1, InputIt2 first2, InputIt2 last2)
 	return excludes(first1, last1, first2, last2, std::less<decltype(*first1)>());
 }
+template<class ResType, class InType, template < typename ... > class ContainerType, class Callback >
+ContainerType<ResType> transform(const ContainerType<InType> & in, Callback transform) {
+	ContainerType<ResType> res;
+	std::transform ( in.begin ( ), in.end ( ), std::inserter ( res, res.begin ( ) ), transform );
+	return res;
+}
+
 } /* namespace std */
 #endif /* ALGORITHM_HPP_ */

alib2std/test-src/extensions/AlgorithmTest.cpp

@@ -49,3 +49,14 @@ void AlgorithmTest::testExclude() {
 	}
 }
+void AlgorithmTest::testTransform() {
+	std::set<int> in = {1, 2, 3, 4};
+	std::set<long> ref = {2, 3, 4, 5};
+
+/*	std::function<long(const int&)> lamb = [](const int& elem) { return (long) elem + 1; };
+	std::set<long> out = std::transform<long>(in, lamb); //*/
+
+	std::set<long> out = std::transform<long>(in, [](const int& elem) { return (long) elem + 1; });
+
+	CPPUNIT_ASSERT(ref == out);
+}

alib2std/test-src/extensions/AlgorithmTest.h

@@ -7,6 +7,7 @@ class AlgorithmTest : public CppUnit::TestFixture
 {
   CPPUNIT_TEST_SUITE( AlgorithmTest );
   CPPUNIT_TEST( testExclude );
+  CPPUNIT_TEST( testTransform );
   CPPUNIT_TEST_SUITE_END();
 public:
@@ -14,6 +15,7 @@ public:
   void tearDown();
   void testExclude();
+  void testTransform();
 };
 #endif  // ALGORITHM_TEST_H_