add list-initializers.cpp

.gitignore

@@ -8,3 +8,4 @@ Makefile
 auto_ptr
 typetest
 unique_ptr
+list-initializers

CMakeLists.txt

@@ -6,3 +6,4 @@ set(CMAKE_CXX_FLAGS    "${CMAKE_CXX_FLAGS} -Wall -pedantic -Wextra -Weffc++")
 add_executable(typetest typetest.cpp)
 add_executable(auto_ptr auto_ptr.cpp)
 add_executable(unique_ptr unique_ptr.cpp)
+add_executable(list-initializers list-initializers.cpp)

list-initializers.cpp

@@ -0,0 +1,31 @@
+#include <iostream>
+#include <map>
+#include <string>
+#include <vector>
+#include <utility>
+
+using namespace std;
+
+int main() {
+
+    // notice how the lists are nested to match the templates' parameters:
+    map<string, vector<pair<string, int>>> name_languages_year {
+        {"Dennis Ritchie",    {{"B",      1969}, {"C",        1973}}},
+        {"Niklaus Wirth",     {{"Pascal", 1970}, {"Modula-2", 1973},
+                               {"Oberon", 1986}}},
+        {"Bjarne Stroustrup", {{"C++",    1983}}},
+        {"Walter Bright",     {{"D",      1999}}}
+    };
+
+    // prints `Pascal':
+    cout << name_languages_year["Niklaus Wirth"].at(0).first << endl;
+
+    // adds a new entry to the map:
+    name_languages_year["John McCarthy"] = {
+        {"Lisp", 1958}
+    };
+
+    // prints 'Lisp':
+    cout << name_languages_year["John McCarthy"].at(0).first << endl;
+
+}