Update ex10_09.cpp

ch10/ex10_09.cpp

@@ -1,6 +1,6 @@
 //!
-//! @author @Yue Wang @shbling @pezy @zzzkl
-//! @date   01.12.2014
+//! @author @Yue Wang @shbling @pezy @zzzkl @Yue Wang
+//! @date   01.12.2014  Jun 2015
 //!
 //! Exercise 10.9:
 //! Implement your own version of elimDups. Test your program by printing
@@ -13,49 +13,33 @@
 #include <vector>
 #include <algorithm>
 
-//! print a container like vector,deque, list,etc.
+// print containers like vector,deque, list, etc.
 template<typename Sequence>
-inline std::ostream& println(Sequence const& seq)
+auto println(Sequence const& seq) -> std::ostream&
 {
-    for(auto const& elem : seq)
+    for (auto const& elem : seq) 
         std::cout << elem << " ";
-    std::cout << std::endl;
-    return std::cout;
+    return std::cout << std::endl;
 }
 
-//! Exercise 10.9
-void elimdups(std::vector<std::string> &vs)
+auto eliminate_duplicates(std::vector<std::string> &vs) -> std::vector<std::string>&
 {
-    println(vs);
-
-    //! sort
     std::sort(vs.begin(), vs.end());
     println(vs);
 
-    //! put all duplicates at the end of the vector
-    auto new_end = std::unique(vs.begin(),vs.end());
+    auto new_end = std::unique(vs.begin(), vs.end());
     println(vs);
-//! ^^^^^^^^^^^^
-//! @attention  Accessing from new_end to end() should be considered as a UB.
-//!             As a result, it would behave differently on different platform.
-//!             For detail, see : https://github.com/Mooophy/Cpp-Primer/pull/85#issuecomment-65016500
 
-    //! erase duplicates
     vs.erase(new_end, vs.end());
-    println(vs);
+    return vs;
 }
 
 int main()
 {
-    //! ex 10.9
-    std::vector<std::string> vs{"a","v","a","s","a","a","a"};
-    std::cout << "ex 10.9:\n";
-    elimdups(vs);
+    std::vector<std::string> vs{ "a", "v", "a", "s", "v", "a", "a" };
+    println(vs);
+    println(eliminate_duplicates(vs));
+
+    system("pause");
     return 0;
 }
-//! output:
-//ex 10.9:
-//a v a s a a a
-//a a a a a s v
-//a s v a a a a  // VS2013 or clang will have some differences. (a s v a a)
-//a s v