_wrap: llgo_check (to be continued)

cpp/std/_wrap/llgo_check.go

@@ -0,0 +1,12 @@
+package main
+
+import (
+	"unsafe"
+
+	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/cpp/std"
+)
+
+func main() {
+	c.Printf(c.Str("sizeof(std::string) = %lu\n"), unsafe.Sizeof(std.String{}))
+}