Merge branch 'master' of https://github.com/chronolaw/cpp_study

Author: chronolaw

section2/auto.cpp

@@ -4,12 +4,16 @@
 // g++ auto.cpp -std=c++14 -o a.out;./a.out
 // g++ auto.cpp -std=c++14 -I../common -o a.out;./a.out
 
+#include <cassert>
+
 #include <iostream>
 #include <string>
 #include <vector>
 #include <set>
 #include <map>
 
+#include <type_traits>
+
 #include <signal.h>
 
 void case1()
@@ -97,6 +101,10 @@ void case6()
     decltype(auto)     x1 = (x);
     decltype(auto)     x2 = &x;
     decltype(auto)     x3 = x1;
+
+    assert(std::is_lvalue_reference<decltype(x1)>::value);
+    assert(std::is_pointer<decltype(x2)>::value);
+    assert(std::is_lvalue_reference<decltype(x3)>::value);
 }
 
 auto get_a_set()

section4/msgpack.cpp

@@ -97,7 +97,11 @@ void case3()
     msgpack::sbuffer sbuf;
     msgpack::pack(sbuf, book1);
 
-    auto obj = msgpack::unpack(sbuf.data(), sbuf.size()).get();
+    // may cause std::bad_cast error
+    //auto obj = msgpack::unpack(sbuf.data(), sbuf.size()).get();
+
+    auto handle = msgpack::unpack(sbuf.data(), sbuf.size());
+    auto obj = handle.get();
 
     Book book2;
     obj.convert(book2);