Add examples for using C++ lambdas with chaiscript. #32

CMakeLists.txt

@@ -182,6 +182,10 @@ if(BUILD_TESTING)
     target_link_libraries(short_comparison_test ${LIBS} ${EXTRA_LINKER_FLAGS})
     add_test(NAME short_comparison_test COMMAND short_comparison_test)
 
+    add_executable(cpp_lambda_test unittests/cpp_lambda_test.cpp)
+    target_link_libraries(cpp_lambda_test ${LIBS} ${EXTRA_LINKER_FLAGS})
+    add_test(NAME cpp_lambda_test COMMAND cpp_lambda_test)
+
 
     add_executable(multifile_test unittests/multifile_test_main.cpp unittests/multifile_test_chai.cpp
       unittests/multifile_test_module.cpp)

unittests/cpp_lambda_test.cpp

@@ -0,0 +1,30 @@
+#include <chaiscript/utility/utility.hpp>
+
+#include <chaiscript/chaiscript_stdlib.hpp>
+
+int main()
+{
+
+  // We cannot deduce the type of a lambda expression, you must either wrap it
+  // in an std::function or provide the signature
+  
+
+  chaiscript::ChaiScript chai(chaiscript::Std_Lib::library());
+
+  // provide the signature
+  chai.add(chaiscript::fun<std::string ()>([] { return "hello"; } ), "f1");
+
+  // wrap
+  chai.add(chaiscript::fun(std::function<std::string ()>([] { return "world"; } )), "f2");
+
+  if (chai.eval<std::string>("f1()") == "hello"
+      && chai.eval<std::string>("f2()") == "world")
+  {
+    return EXIT_SUCCESS;
+  } else {
+    return EXIT_FAILURE;
+  }
+
+
+
+}