Implement few builtin functions that can operate on any value

type()
null()
empty ()
identity()

1 files changed, 24 insertions, 0 deletions

diff --git a/build2/functions-builtin.cxx b/build2/functions-builtin.cxx
new file mode 100644
index 0000000..448bb53
--- /dev/null
+++ b/build2/functions-builtin.cxx
@@ -0,0 +1,24 @@
+// file      : build2/functions-builtin.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <build2/function>
+#include <build2/variable>
+
+using namespace std;
+
+namespace build2
+{
+  void
+  builtin_functions ()
+  {
+    function_family f ("builtin");
+
+    f["type"] = [](value* v) {return v->type != nullptr ? v->type->name : "";};
+
+    f["null"]  = [](value* v) {return v->null;};
+    f["empty"] = [](value v)  {return v.empty ();};
+
+    f["identity"] = [](value* v) {return move (*v);};
+  }
+}