Added example from boost.

src/Interpreters/tests/CMakeLists.txt

@@ -29,6 +29,9 @@ target_link_libraries (string_hash_map PRIVATE dbms)
 add_executable (string_hash_map_aggregation string_hash_map.cpp)
 target_link_libraries (string_hash_map_aggregation PRIVATE dbms)
 
+add_executable (context context.cpp)
+target_link_libraries (context PRIVATE dbms)
+
 add_executable (two_level_hash_map two_level_hash_map.cpp)
 target_include_directories (two_level_hash_map SYSTEM BEFORE PRIVATE ${SPARSEHASH_INCLUDE_DIR})
 target_link_libraries (two_level_hash_map PRIVATE dbms)

src/Interpreters/tests/context.cpp

@@ -0,0 +1,26 @@
+#include <iostream>
+#include <boost/context/fiber.hpp>
+
+int main(int, char **)
+{
+    namespace ctx=boost::context;
+    int a;
+    ctx::fiber source{[&a](ctx::fiber&& sink)
+    {
+        a=0;
+        int b=1;
+        while (true)
+        {
+            sink=std::move(sink).resume();
+            int next=a+b;
+            a=b;
+            b=next;
+        }
+        return std::move(sink);
+    }};
+    for (int j=0;j<10;++j)
+    {
+        source=std::move(source).resume();
+        std::cout << a << " ";
+    }
+}