added 10.26 ~ 28 to README.md and simplify 10.2728

ch10/README.md

@@ -58,3 +58,14 @@ The additional one is for the function to be bound itself.
 
 ##[Exercise 10.24](ex10_24.cpp)
 ##[Exercise 10.25](ex10_25.cpp)
+
+## Exercise 10.26:
+>Explain the differences among the three kinds of insert iterators.
+
+- `back_inserter` uses `push_back`.
+- `front_inserter` uses `push_front`.
+- `insert` uses `insert`
+>This function takes a second argument, which must be an iterator into the given container. Elements are inserted ahead of the element denoted by the given iterator.
+
+## [Exercise 10.27](ex10_27.cpp)
+## [Exercise 10.28](ex10_28.cpp)

ch10/ex10_27.cpp

@@ -0,0 +1,27 @@
+//
+//  ex10_27.cpp
+//  Exercise 10.27
+//
+//  Created by pezy on 12/13/14.
+//  Copyright (c) 2014 pezy. All rights reserved.
+//
+//  In addition to unique, the library defines function named unique_copy that
+//  takes a third iterator denoting a destination into which to copy the unique elements.
+//  Write a program that uses unique_copy to copy the unique elements from
+//  a vector into an initially empty list.
+
+#include <iostream>
+#include <algorithm>
+#include <vector>
+#include <list>
+
+int main()
+{
+    std::vector<int> vec{1,1,3,3,5,5,7,7,9};
+    std::list<int> lst;
+
+    std::unique_copy(vec.begin(), vec.end(), back_inserter(lst));
+    for (auto i : lst)
+        std::cout << i << " ";
+    std::cout << std::endl;
+}

ch10/ex10_28.cpp

@@ -0,0 +1,47 @@
+//
+//  ex10_28.cpp
+//  Exercise 10.28
+//
+//  Created by pezy on 12/13/14.
+//  Copyright (c) 2014 pezy. All rights reserved.
+//
+//  Copy a vector that holds the values from 1 to 9 inclusive, into three other containers.
+//  Use an inserter, a back_inserter, and a front_inserter, respectivly to add elements to these containers.
+//  Predict how the output sequence varies by the kind of inserter and verify your predictions
+//  by running your programs.
+
+
+#include <iostream>
+#include <algorithm>
+#include <vector>
+#include <list>
+
+using std::list; using std::copy; using std::cout; using std::endl;
+
+template<typename Sequence>
+void print(Sequence const& seq)
+{
+    for (const auto& i : seq)
+        std::cout << i << " ";
+    std::cout << std::endl;
+}
+
+int main()
+{
+    std::vector<int> vec{1,2,3,4,5,6,7,8,9};
+
+    // uses inserter
+    list<int> lst1;
+    copy(vec.cbegin(), vec.cend(), inserter(lst1, lst1.begin()));
+    print(lst1);
+
+    // uses back_inserter
+    list<int> lit2;
+    copy(vec.cbegin(), vec.cend(), back_inserter(lit2));
+    print(lit2);
+
+    // uses front_inserter
+    list<int> lst3;
+    copy(vec.cbegin(), vec.cend(), front_inserter(lst3));
+    print(lst3);
+}