add index creation examples

Author: amidvidy

examples/CMakeLists.txt

@@ -6,10 +6,11 @@ include_directories(
 
 set(MONGOCXX_EXAMPLES
   aggregate.cpp
+  create.cpp
+  index.cpp
   query.cpp
   remove.cpp
   update.cpp
-  create.cpp
 )
 
 foreach(EXAMPLE_SRC ${MONGOCXX_EXAMPLES})

examples/index.cpp

@@ -0,0 +1,30 @@
+#include <bsoncxx/builder.hpp>
+
+#include <mongocxx/client.hpp>
+
+using namespace bsoncxx::builder::helpers;
+using bsoncxx::builder::document;
+
+int main(int, char**) {
+    mongocxx::client conn{};
+
+    auto db = conn["test"];
+    
+    // Create a single field index.
+    {
+        // @begin: cpp-single-field-index
+        document index_spec;
+        index_spec << "cuisine" << 1;
+        db["restaurants"].create_index(index_spec, {});
+        // @end: cpp-single-field-index
+    }
+    
+    // Create a compound index.
+    {
+        // @begin: cpp-create-compound-index
+        document index_spec;
+        index_spec << "cuisine" << 1 << "address.zipcode" << -1;
+        db["restaurants"].create_index(index_spec, {});
+        // @end: cpp-create-compound-index
+    }
+}