fix: compilation error for structured binding (changkun#35)

jyj407 · changkun · commit e80a7120ef23 · 2018-06-13T13:51:35.000+02:00
The header  &lt;tuple&gt; is missing. After adding it, it compiles fine with clang in c++17 mode.
diff --git a/code/2/2.05.structured.binding.cpp b/code/2/2.05.structured.binding.cpp
@@ -7,6 +7,7 @@
 //
 
 #include <iostream>
+#include <tuple>
 #include <string>
 
 std::tuple<int, double, std::string> f() {
