Merge pull request #12 from Cysharp/fix-pointer-pointer

Fix pointer pointer

README.md

@@ -224,7 +224,7 @@ csbindgen::Builder::default()
     .input_bindgen_file("src/lz4.rs")             // required
     .method_filter(|x| { x.starts_with("LZ4") } ) // optional, default: |x| !x.starts_with('_')
     .rust_method_prefix("csbindgen_")             // optional, default: "csbindgen_"
-    .rust_file_header("use super::lz4;")          // optional, default: ""
+    .rust_file_header("use super::lz4::*;")       // optional, default: ""
     .rust_method_type_path("lz4")                 // optional, default: ""
     .csharp_dll_name("lz4")                       // required
     .csharp_class_name("NativeMethods")           // optional, default: NativeMethods
@@ -369,6 +369,8 @@ Rust types will map these C# types.
 | `*const T` | `T*` |
 | `*mut *mut T` | `T**` |
 | `*const *const T` | `T**` |
+| `*mut *const T` | `T**` |
+| `*const *mut T` | `T**` |
 
 csbindgen is designed to return primitives that do not cause marshalling. It is better to convert from pointers to Span yourself than to do the conversion implicitly and in a black box. This is a recent trend, such as the addition of [DisableRuntimeMarshalling](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.compilerservices.disableruntimemarshallingattribute) from .NET 7.
 
@@ -814,7 +816,53 @@ finally
 }
 ```
 
-C# to Rust would be a bit simpler to send, just pass byte* and length. In Rust, use `std::slice::from_raw_parts` to create slice. Again, the important thing is that memory allocated in Rust must release in Rust and memory allocated in C# must release in C#.
+C# to Rust would be a bit simpler to send, just pass byte* and length. In Rust, use `std::slice::from_raw_parts` to create slice. 
+
+```rust
+#[no_mangle]
+pub unsafe extern "C" fn csharp_to_rust_string(utf16_str: *const u16, utf16_len: i32) {
+    let slice = std::slice::from_raw_parts(utf16_str, utf16_len as usize);
+    let str = String::from_utf16(slice).unwrap();
+    println!("{}", str);
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn csharp_to_rust_utf8(utf8_str: *const u8, utf8_len: i32) {
+    let slice = std::slice::from_raw_parts(utf8_str, utf8_len as usize);
+    let str = String::from_utf8_unchecked(slice.to_vec());
+    println!("{}", str);
+}
+
+
+#[no_mangle]
+pub unsafe extern "C" fn csharp_to_rust_bytes(bytes: *const u8, len: i32) {
+    let slice = std::slice::from_raw_parts(bytes, len as usize);
+    let vec = slice.to_vec();
+    println!("{:?}", vec);
+}
+```
+
+```csharp
+var str = "foobarbaz:あいうえお"; // JPN(Unicode)
+fixed (char* p = str)
+{
+    NativeMethods.csharp_to_rust_string((ushort*)p, str.Length);
+}
+
+var str2 = Encoding.UTF8.GetBytes("あいうえお:foobarbaz");
+fixed (byte* p = str2)
+{
+    NativeMethods.csharp_to_rust_utf8(p, str2.Length);
+}
+
+var bytes = new byte[] { 1, 10, 100, 255 };
+fixed (byte* p = bytes)
+{
+    NativeMethods.csharp_to_rust_bytes(p, bytes.Length);
+}
+```
+
+Again, the important thing is that memory allocated in Rust must release in Rust and memory allocated in C# must release in C#.
 
 Build Tracing
 ---

csbindgen-tests/build.rs

@@ -61,16 +61,17 @@ fn main() -> Result<(), Box<dyn Error>> {
 
     csbindgen::Builder::default()
         .input_extern_file("src/lib.rs")
-        .csharp_class_name("LibRust")
+        .csharp_class_name("NativeMethods")
         .csharp_dll_name("csbindgen_tests")
         .csharp_use_function_pointer(true)
-        .generate_csharp_file("../dotnet-sandbox/method_call.cs")
+        .generate_csharp_file("../dotnet-sandbox/NativeMethods.cs")
         .unwrap();
 
     // csbindgen::Builder::new()
     //     .input_bindgen_file("src/zstd.rs")
     //     .method_filter(|x| x.starts_with("ZSTD_"))
     //     .rust_method_prefix("csbindgen_zstd_")
+    //     .rust_file_header("use super::zstd::*;")
     //     .csharp_class_name("LibZstd")
     //     .csharp_dll_name("libzsd")
     //     .generate_to_file("src/zstd_ffi.rs", "../dotnet-sandbox/zstd_bindgen.cs")?;
@@ -78,6 +79,7 @@ fn main() -> Result<(), Box<dyn Error>> {
     // csbindgen::Builder::new()
     //     .input_bindgen_file("src/quiche.rs")
     //     .method_filter(|x| x.starts_with("quiche_"))
+    //     .rust_file_header("use super::quiche::*;")
     //     .rust_method_prefix("csbindgen_quiche_")
     //     .csharp_class_name("LibQuiche")
     //     .csharp_dll_name("libquiche")
@@ -86,7 +88,9 @@ fn main() -> Result<(), Box<dyn Error>> {
     // csbindgen::Builder::new()
     //     .input_bindgen_file("src/bullet3.rs")
     //     .method_filter(|x| x.starts_with("b3"))
+    //     .rust_file_header("use super::bullet3::*;")
     //     .rust_method_prefix("csbindgen_bullet3_")
+    //     .csharp_entry_point_prefix("csbindgen_bullet3_")
     //     .csharp_class_name("LibBullet3")
     //     .csharp_dll_name("libbullet3")
     //     .generate_to_file("src/bullet3_ffi.rs", "../dotnet-sandbox/bullet3_bindgen.cs")?;

csbindgen-tests/src/bullet3_ffi.rs

@@ -3,7 +3,7 @@
 #[allow(unused)]
 use ::std::os::raw::*;
 
-
+use super::bullet3::*;
 
 
 #[no_mangle]
@@ -246,10 +246,10 @@ pub unsafe extern "C" fn csbindgen_bullet3_b3GetStatusActualState(
     bodyUniqueId: *mut c_int,
     numDegreeOfFreedomQ: *mut c_int,
     numDegreeOfFreedomU: *mut c_int,
-    rootLocalInertialFrame: *mut *mut f64,
+    rootLocalInertialFrame: *mut *const f64,
-    actualStateQ: *mut *mut f64,
+    actualStateQ: *mut *const f64,
-    actualStateQdot: *mut *mut f64,
+    actualStateQdot: *mut *const f64,
-    jointReactionForces: *mut *mut f64    
+    jointReactionForces: *mut *const f64    
 ) -> c_int
 {
     b3GetStatusActualState(
@@ -271,14 +271,14 @@ pub unsafe extern "C" fn csbindgen_bullet3_b3GetStatusActualState2(
     numLinks: *mut c_int,
     numDegreeOfFreedomQ: *mut c_int,
     numDegreeOfFreedomU: *mut c_int,
-    rootLocalInertialFrame: *mut *mut f64,
+    rootLocalInertialFrame: *mut *const f64,
-    actualStateQ: *mut *mut f64,
+    actualStateQ: *mut *const f64,
-    actualStateQdot: *mut *mut f64,
+    actualStateQdot: *mut *const f64,
-    jointReactionForces: *mut *mut f64,
+    jointReactionForces: *mut *const f64,
-    linkLocalInertialFrames: *mut *mut f64,
+    linkLocalInertialFrames: *mut *const f64,
-    jointMotorForces: *mut *mut f64,
+    jointMotorForces: *mut *const f64,
-    linkStates: *mut *mut f64,
+    linkStates: *mut *const f64,
-    linkWorldVelocities: *mut *mut f64    
+    linkWorldVelocities: *mut *const f64    
 ) -> c_int
 {
     b3GetStatusActualState2(
@@ -565,7 +565,7 @@ pub unsafe extern "C" fn csbindgen_bullet3_b3GetUserDataInfo(
     physClient: b3PhysicsClientHandle,
     bodyUniqueId: c_int,
     userDataIndex: c_int,
-    keyOut: *mut *mut c_char,
+    keyOut: *mut *const c_char,
     userDataIdOut: *mut c_int,
     linkIndexOut: *mut c_int,
     visualShapeIndexOut: *mut c_int    

csbindgen-tests/src/lib.rs

@@ -14,6 +14,39 @@ mod lz4;
 #[allow(non_camel_case_types)]
 mod lz4_ffi;
 
+// #[allow(dead_code)]
+// #[allow(non_snake_case)]
+// #[allow(non_camel_case_types)]
+// #[allow(non_upper_case_globals)]
+// mod bullet3;
+
+// #[allow(dead_code)]
+// #[allow(non_snake_case)]
+// #[allow(non_camel_case_types)]
+// mod bullet3_ffi;
+
+// #[allow(dead_code)]
+// #[allow(non_snake_case)]
+// #[allow(non_camel_case_types)]
+// #[allow(non_upper_case_globals)]
+// mod quiche;
+
+// #[allow(dead_code)]
+// #[allow(non_snake_case)]
+// #[allow(non_camel_case_types)]
+// mod quiche_ffi;
+
+// #[allow(dead_code)]
+// #[allow(non_snake_case)]
+// #[allow(non_camel_case_types)]
+// #[allow(non_upper_case_globals)]
+// mod zstd;
+
+// #[allow(dead_code)]
+// #[allow(non_snake_case)]
+// #[allow(non_camel_case_types)]
+// mod zstd_ffi;
+
 #[allow(non_camel_case_types)]
 pub type LONG_PTR = ::std::os::raw::c_longlong;
 #[allow(non_camel_case_types)]
@@ -34,6 +67,33 @@ pub unsafe extern "C" fn nullpointer_test(p: *const u8) {
     };
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn csharp_to_rust_string(utf16_str: *const u16, utf16_len: i32) {
+    let slice = std::slice::from_raw_parts(utf16_str, utf16_len as usize);
+
+    let str = String::from_utf16(slice).unwrap();
+
+    println!("{}", str);
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn csharp_to_rust_utf8(utf8_str: *const u8, utf8_len: i32) {
+    let slice = std::slice::from_raw_parts(utf8_str, utf8_len as usize);
+    let str = String::from_utf8_unchecked(slice.to_vec());
+    println!("{}", str);
+}
+
+
+#[no_mangle]
+pub unsafe extern "C" fn csharp_to_rust_bytes(bytes: *const u8, len: i32) {
+    let slice = std::slice::from_raw_parts(bytes, len as usize);
+    let vec = slice.to_vec();
+    println!("{:?}", vec);
+}
+
+
+
+
 #[no_mangle]
 pub extern "C" fn callback_test(cb: extern "C" fn(a: i32) -> i32) -> i32 {
     cb(100)
@@ -46,11 +106,11 @@ pub extern "C" fn csharp_to_rust(cb: extern "C" fn(x: i32, y: i32) -> i32) {
 }
 
 #[no_mangle]
-pub extern "C" fn rust_to_csharp() -> extern fn(x: i32, y: i32) -> i32 {
+pub extern "C" fn rust_to_csharp() -> extern "C" fn(x: i32, y: i32) -> i32 {
     sum // return rust method
 }
 
-extern "C" fn sum(x:i32, y:i32) -> i32 {
+extern "C" fn sum(x: i32, y: i32) -> i32 {
     x + y
 }
 

csbindgen-tests/src/quiche_ffi.rs

@@ -3,7 +3,7 @@
 #[allow(unused)]
 use ::std::os::raw::*;
 
-
+use super::quiche::*;
 
 
 #[no_mangle]
@@ -18,7 +18,7 @@ pub unsafe extern "C" fn csbindgen_quiche_quiche_version(
 
 #[no_mangle]
 pub unsafe extern "C" fn csbindgen_quiche_quiche_enable_debug_logging(
-    cb: Option<extern "C" fn(line: *const c_char, argp: *mut c_void)>,
+    cb: Option<unsafe extern "C" fn(line: *const c_char, argp: *mut c_void)>,
     argp: *mut c_void    
 ) -> c_int
 {
@@ -899,7 +899,7 @@ pub unsafe extern "C" fn csbindgen_quiche_quiche_conn_close(
 #[no_mangle]
 pub unsafe extern "C" fn csbindgen_quiche_quiche_conn_trace_id(
     conn: *const quiche_conn,
-    out: *mut *mut u8,
+    out: *mut *const u8,
     out_len: *mut usize    
 )
 {
@@ -913,7 +913,7 @@ pub unsafe extern "C" fn csbindgen_quiche_quiche_conn_trace_id(
 #[no_mangle]
 pub unsafe extern "C" fn csbindgen_quiche_quiche_conn_source_id(
     conn: *const quiche_conn,
-    out: *mut *mut u8,
+    out: *mut *const u8,
     out_len: *mut usize    
 )
 {
@@ -927,7 +927,7 @@ pub unsafe extern "C" fn csbindgen_quiche_quiche_conn_source_id(
 #[no_mangle]
 pub unsafe extern "C" fn csbindgen_quiche_quiche_conn_destination_id(
     conn: *const quiche_conn,
-    out: *mut *mut u8,
+    out: *mut *const u8,
     out_len: *mut usize    
 )
 {
@@ -941,7 +941,7 @@ pub unsafe extern "C" fn csbindgen_quiche_quiche_conn_destination_id(
 #[no_mangle]
 pub unsafe extern "C" fn csbindgen_quiche_quiche_conn_application_proto(
     conn: *const quiche_conn,
-    out: *mut *mut u8,
+    out: *mut *const u8,
     out_len: *mut usize    
 )
 {
@@ -955,7 +955,7 @@ pub unsafe extern "C" fn csbindgen_quiche_quiche_conn_application_proto(
 #[no_mangle]
 pub unsafe extern "C" fn csbindgen_quiche_quiche_conn_peer_cert(
     conn: *const quiche_conn,
-    out: *mut *mut u8,
+    out: *mut *const u8,
     out_len: *mut usize    
 )
 {
@@ -969,7 +969,7 @@ pub unsafe extern "C" fn csbindgen_quiche_quiche_conn_peer_cert(
 #[no_mangle]
 pub unsafe extern "C" fn csbindgen_quiche_quiche_conn_session(
     conn: *const quiche_conn,
-    out: *mut *mut u8,
+    out: *mut *const u8,
     out_len: *mut usize    
 )
 {
@@ -1065,7 +1065,7 @@ pub unsafe extern "C" fn csbindgen_quiche_quiche_conn_peer_error(
     conn: *const quiche_conn,
     is_app: *mut bool,
     error_code: *mut u64,
-    reason: *mut *mut u8,
+    reason: *mut *const u8,
     reason_len: *mut usize    
 ) -> bool
 {
@@ -1083,7 +1083,7 @@ pub unsafe extern "C" fn csbindgen_quiche_quiche_conn_local_error(
     conn: *const quiche_conn,
     is_app: *mut bool,
     error_code: *mut u64,
-    reason: *mut *mut u8,
+    reason: *mut *const u8,
     reason_len: *mut usize    
 ) -> bool
 {
@@ -1261,7 +1261,7 @@ pub unsafe extern "C" fn csbindgen_quiche_quiche_conn_dgram_send(
 #[no_mangle]
 pub unsafe extern "C" fn csbindgen_quiche_quiche_conn_dgram_purge_outgoing(
     conn: *mut quiche_conn,
-    f: Option<extern "C" fn(arg1: *mut u8, arg2: usize) -> bool>    
+    f: Option<unsafe extern "C" fn(arg1: *mut u8, arg2: usize) -> bool>    
 )
 {
     quiche_conn_dgram_purge_outgoing(
@@ -1427,7 +1427,7 @@ pub unsafe extern "C" fn csbindgen_quiche_quiche_h3_event_type(
 #[no_mangle]
 pub unsafe extern "C" fn csbindgen_quiche_quiche_h3_event_for_each_header(
     ev: *mut quiche_h3_event,
-    cb: Option<extern "C" fn(name: *mut u8, name_len: usize, value: *mut u8, value_len: usize, argp: *mut c_void) -> c_int>,
+    cb: Option<unsafe extern "C" fn(name: *mut u8, name_len: usize, value: *mut u8, value_len: usize, argp: *mut c_void) -> c_int>,
     argp: *mut c_void    
 ) -> c_int
 {
@@ -1441,7 +1441,7 @@ pub unsafe extern "C" fn csbindgen_quiche_quiche_h3_event_for_each_header(
 #[no_mangle]
 pub unsafe extern "C" fn csbindgen_quiche_quiche_h3_for_each_setting(
     conn: *mut quiche_h3_conn,
-    cb: Option<extern "C" fn(identifier: u64, value: u64, argp: *mut c_void) -> c_int>,
+    cb: Option<unsafe extern "C" fn(identifier: u64, value: u64, argp: *mut c_void) -> c_int>,
     argp: *mut c_void    
 ) -> c_int
 {
@@ -1614,7 +1614,7 @@ pub unsafe extern "C" fn csbindgen_quiche_quiche_h3_send_priority_update_for_req
 pub unsafe extern "C" fn csbindgen_quiche_quiche_h3_take_last_priority_update(
     conn: *mut quiche_h3_conn,
     prioritized_element_id: u64,
-    cb: Option<extern "C" fn(priority_field_value: *mut u8, priority_field_value_len: u64, argp: *mut c_void) -> c_int>,
+    cb: Option<unsafe extern "C" fn(priority_field_value: *mut u8, priority_field_value_len: u64, argp: *mut c_void) -> c_int>,
     argp: *mut c_void    
 ) -> c_int
 {

csbindgen-tests/src/zstd_ffi.rs

@@ -3,7 +3,7 @@
 #[allow(unused)]
 use ::std::os::raw::*;
 
-
+use super::zstd::*;
 
 
 #[no_mangle]

csbindgen/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "csbindgen"
-version = "1.0.0"
+version = "1.1.0"
 edition = "2021"
 authors = [
   "Yoshifumi Kawai <ils@neue.cc>",

csbindgen/src/parser.rs

@@ -258,8 +258,7 @@ pub fn reduce_enum(
 fn parse_type(t: &syn::Type) -> RustType {
     match t {
         syn::Type::Ptr(t) => {
-            let has_const = t.const_token.is_some();
+            let has_const = t.const_token.is_some(); // not is has_mut
-            // let has_mut = t.mutability.is_some();
 
             if let syn::Type::Path(path) = &*t.elem {
                 return RustType {
@@ -272,13 +271,18 @@ fn parse_type(t: &syn::Type) -> RustType {
                 };
             } else if let syn::Type::Ptr(t) = &*t.elem {
                 if let syn::Type::Path(path) = &*t.elem {
+                    let has_const2 = t.const_token.is_some();
+
+                    let pointer_type = match (has_const, has_const2) {
+                        (true, true) => PointerType::ConstPointerPointer,
+                        (true, false) => PointerType::ConstMutPointerPointer,
+                        (false, true) => PointerType::MutConstPointerPointer,
+                        (false, false) => PointerType::MutPointerPointer,
+                    };
+
                     return RustType {
                         type_name: path.path.segments.last().unwrap().ident.to_string(),
-                        type_kind: TypeKind::Pointer(if has_const {
+                        type_kind: TypeKind::Pointer(pointer_type),
-                            PointerType::ConstPointerPointer
-                        } else {
-                            PointerType::MutPointerPointer
-                        }),
                     };
                 }
             }
@@ -345,7 +349,7 @@ fn parse_type(t: &syn::Type) -> RustType {
             };
 
             return RustType {
-                type_name: "extern \"C\" fn".to_string(),
+                type_name: "unsafe extern \"C\" fn".to_string(),
                 type_kind: TypeKind::Function(parameters, ret),
             };
         }

csbindgen/src/type_meta.rs

@@ -77,6 +77,8 @@ pub enum PointerType {
     MutPointer,
     ConstPointerPointer,
     MutPointerPointer,
+    ConstMutPointerPointer,
+    MutConstPointerPointer
 }
 
 #[derive(Clone, Debug)]
@@ -103,6 +105,8 @@ impl RustType {
                 MutPointer => sb.push_str("*mut"),
                 ConstPointerPointer => sb.push_str("*const *const"),
                 MutPointerPointer => sb.push_str("*mut *mut"),
+                ConstMutPointerPointer =>sb.push_str("*const *mut"),
+                MutConstPointerPointer =>sb.push_str("*mut *const"),
             };
         }
 
@@ -305,12 +309,13 @@ impl RustType {
                 sb.push_str(convert_type_name(use_type.type_name.as_str()));
 
                 if use_alias {
+                    use PointerType::*;
                     if let TypeKind::Pointer(p) = &use_type.type_kind {
                         match p {
-                            PointerType::MutPointer | PointerType::ConstPointer => {
+                            MutPointer | ConstPointer => {
                                 sb.push('*');
                             }
-                            PointerType::MutPointerPointer | PointerType::ConstPointerPointer => {
+                            MutPointerPointer | ConstPointerPointer | MutConstPointerPointer | ConstMutPointerPointer  => {
                                 sb.push_str("**");
                             }
                         }
@@ -318,11 +323,12 @@ impl RustType {
                 }
 
                 if let TypeKind::Pointer(p) = &self.type_kind {
+                    use PointerType::*;
                     match p {
-                        PointerType::MutPointer | PointerType::ConstPointer => {
+                        MutPointer | ConstPointer => {
                             sb.push('*');
                         }
-                        PointerType::MutPointerPointer | PointerType::ConstPointerPointer => {
+                        MutPointerPointer | ConstPointerPointer | MutConstPointerPointer | ConstMutPointerPointer => {
                             sb.push_str("**");
                         }
                     }

dotnet-sandbox/NativeMethods.cs

@@ -8,7 +8,7 @@ using System.Runtime.InteropServices;
 
 namespace CsBindgen
 {
-    internal static unsafe partial class LibRust
+    internal static unsafe partial class NativeMethods
     {
         const string __DllName = "csbindgen_tests";
 
@@ -21,6 +21,15 @@ namespace CsBindgen
         [DllImport(__DllName, EntryPoint = "nullpointer_test", CallingConvention = CallingConvention.Cdecl)]
         public static extern void nullpointer_test(byte* p);
 
+        [DllImport(__DllName, EntryPoint = "csharp_to_rust_string", CallingConvention = CallingConvention.Cdecl)]
+        public static extern void csharp_to_rust_string(ushort* utf16_str, int utf16_len);
+
+        [DllImport(__DllName, EntryPoint = "csharp_to_rust_utf8", CallingConvention = CallingConvention.Cdecl)]
+        public static extern void csharp_to_rust_utf8(byte* utf8_str, int utf8_len);
+
+        [DllImport(__DllName, EntryPoint = "csharp_to_rust_bytes", CallingConvention = CallingConvention.Cdecl)]
+        public static extern void csharp_to_rust_bytes(byte* bytes, int len);
+
         [DllImport(__DllName, EntryPoint = "callback_test", CallingConvention = CallingConvention.Cdecl)]
         public static extern int callback_test(delegate* unmanaged[Cdecl]<int, int> cb);
 

dotnet-sandbox/Program.cs

@@ -15,19 +15,44 @@ unsafe
 {
 
 
-    LibRust.alias_test1(null);
 
-    //LibRust.call_bindgen_lz4();
+    //NativeMethods.call_bindgen_lz4();
+
+
+    var str = "foobarbaz:あいうえお"; // JPN(Unicode)
+    fixed (char* p = str)
+    {
+        NativeMethods.csharp_to_rust_string((ushort*)p, str.Length);
+    }
+
+    var str2 = Encoding.UTF8.GetBytes("あいうえお:foobarbaz");
+    fixed (byte* p = str2)
+    {
+        NativeMethods.csharp_to_rust_utf8(p, str2.Length);
+    }
+
+    var bytes = new byte[] { 1, 10, 100, 255 };
+    fixed (byte* p = bytes)
+    {
+        NativeMethods.csharp_to_rust_bytes(p, bytes.Length);
+    }
+
+
+
+    //NativeMethods.csharp_to_rust_utf8
+    //NativeMethods.alias_test1(null);
+
+
 
 
     // C# -> Rust, pass static UnmanagedCallersOnly method with `&`
     [UnmanagedCallersOnly(CallConvs = new[] { typeof(CallConvCdecl) })]
     static int Sum(int x, int y) => x + y;
 
-    LibRust.csharp_to_rust(&Sum);
+    NativeMethods.csharp_to_rust(&Sum);
 
     // Rust -> C#, get typed delegate*
-    var f = LibRust.rust_to_csharp();
+    var f = NativeMethods.rust_to_csharp();
 
     var v = f(20, 30);
     Console.WriteLine(v); // 50
@@ -49,18 +74,18 @@ unsafe
     //Console.WriteLine(cc);
 
 
-        var context = LibRust.create_context();
+    //    var context = LibRust.create_context();
 
-        // do anything...
+    //    // do anything...
 
-        LibRust.delete_context(context);
+    //    LibRust.delete_context(context);
 
-    var ctx = LibRust.create_counter_context(); // ctx = void*
+    //var ctx = LibRust.create_counter_context(); // ctx = void*
 
-    LibRust.insert_counter_context(ctx, 10);
+    //LibRust.insert_counter_context(ctx, 10);
-    LibRust.insert_counter_context(ctx, 20);
+    //LibRust.insert_counter_context(ctx, 20);
 
-    LibRust.delete_counter_context(ctx);
+    //LibRust.delete_counter_context(ctx);
 
     //LibRust.insert_counter_context(ctx, 20);
     //LibRust.insert_counter_context(ctx, 30);