diff --git a/cpp/inih/_wrap/llgo_check.cpp b/cpp/inih/_wrap/llgo_check.cpp
new file mode 100644
index 00000000..2a1a5bf7
--- /dev/null
+++ b/cpp/inih/_wrap/llgo_check.cpp
@@ -0,0 +1,7 @@
+#include <stdio.h>
+#include <INIReader.h>
+
+int main() {
+    printf("sizeof(Reader) = %lu\n", sizeof(INIReader));
+    return 0;
+}
diff --git a/cpp/inih/_wrap/llgo_check.go b/cpp/inih/_wrap/llgo_check.go
new file mode 100644
index 00000000..a5ae28ec
--- /dev/null
+++ b/cpp/inih/_wrap/llgo_check.go
@@ -0,0 +1,16 @@
+package main
+
+import (
+	"unsafe"
+
+	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/cpp/inih"
+)
+
+const (
+	LLGoCFlags = "$(pkg-config --cflags INIReader)"
+)
+
+func main() {
+	c.Printf(c.Str("sizeof(Reader) = %lu\n"), unsafe.Sizeof(inih.Reader{}))
+}
diff --git a/cpp/inih/reader.go b/cpp/inih/reader.go
index ee194e77..6f0a1638 100644
--- a/cpp/inih/reader.go
+++ b/cpp/inih/reader.go
@@ -27,7 +27,7 @@ import (
 
 // llgo:type C
 type Reader struct {
-	Unused [24]byte
+	Unused [32]byte
 }
 
 // llgo:link (*Reader).InitFromBuffer C._ZN9INIReaderC1EPKcm
diff --git a/cpp/std/_wrap/llgo_check.cpp b/cpp/std/_wrap/llgo_check.cpp
new file mode 100644
index 00000000..1149cec3
--- /dev/null
+++ b/cpp/std/_wrap/llgo_check.cpp
@@ -0,0 +1,7 @@
+#include <stdio.h>
+#include <string>
+
+int main() {
+    printf("sizeof(std::string) = %lu\n", sizeof(std::string));
+    return 0;
+}
diff --git a/cpp/std/_wrap/llgo_check.go b/cpp/std/_wrap/llgo_check.go
new file mode 100644
index 00000000..1a0f0e13
--- /dev/null
+++ b/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{}))
+}
diff --git a/cpp/std/_wrap/string.cpp b/cpp/std/_wrap/string.cpp
index 94f73508..ba17a915 100644
--- a/cpp/std/_wrap/string.cpp
+++ b/cpp/std/_wrap/string.cpp
@@ -1,4 +1,5 @@
 #include <string>
+#include <new>
 
 extern "C" {