fix(cpp): build and repair asset::AssetContext

CHANGELOG.md

@@ -8,6 +8,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- **C++ SDK:** `asset::AssetContext` (`statements` / `statement_download_url`) is now actually built and usable. `longbridge.hpp` has always included `asset_context.hpp`, but `cpp/src/asset_context.cpp` was never listed in `cpp/CMakeLists.txt`, so the class was declared to users and then failed to link. It had also never compiled: it included neither `longbridge.h` nor the C declarations, and `statement_download_url` read `res->data` as a `lb_statement_download_url_response_t*` — a type that does not exist anywhere in the C layer, which delivers the URL as a bare `const char*` (the same convention as `QuoteContext::quote_level`). Fixed the include and the callback, and added the file to the build
+- **C SDK:** export `lb_statement_item_t` from `longbridge.h`. `CStatementItem` is only reachable through the `void*` async-result pointer, so cbindgen did not emit it and no C or C++ caller could read what `lb_asset_context_statements` returns. Also added the missing `CAssetContext` → `lb_asset_context_t` entry to the cbindgen rename map: every other context type was mapped, so the header exposed the raw Rust name (`const struct CAssetContext *lb_asset_context_new(...)`) while the C++ side forward-declared `lb_asset_context_t`
 - **C/C++ SDKs:** every list argument that crosses the FFI boundary now tolerates a null pointer with a zero length. `std::vector::data()` is allowed to return `nullptr` for an empty vector, which is exactly what the C++ binding passes for an omitted list argument, but the C layer fed it straight to `std::slice::from_raw_parts` — undefined behaviour that **aborts the process** under the debug UB checks. Hit live by `QuoteContext::warrant_list` with no filters (`c/src/quote_context/context.rs`); all 17 call sites across `quote_context`, `trade_context`, `agent_context`, `alert_context`, and `types` now go through a null-tolerant `slice_from_raw_parts` helper
 
 ### Added

c/cbindgen.toml

@@ -167,6 +167,8 @@ cpp_compat = true
 "CCalendarContext" = "lb_calendar_context_t"
 "CPortfolioContext" = "lb_portfolio_context_t"
 "CMarketContext" = "lb_market_context_t"
+"CAssetContext" = "lb_asset_context_t"
+"CStatementItem" = "lb_statement_item_t"
 # MarketContext types
 "CMarketTimeItem" = "lb_market_time_item_t"
 "CMarketStatusResponse" = "lb_market_status_response_t"
@@ -428,6 +430,8 @@ include = [
     "CWatchlistSecurity",
     "CMarginRatio",
     "COrderDetail",
+    # AssetContext: statements (reachable only via void* async data pointer)
+    "CStatementItem",
     # GridContext: grid trading (reachable only via void* async data pointer)
     "CSubmitGridOrderResponse",
     "CGridOrder", "CGridOrderSubOrder", "CGridOrderHistory", "CGridOrderDetail",

c/csrc/include/longbridge.h

@@ -1853,7 +1853,7 @@ typedef struct lb_alert_context_t lb_alert_context_t;
 /**
  * Asset context
  */
-typedef struct CAssetContext CAssetContext;
+typedef struct lb_asset_context_t lb_asset_context_t;
 
 typedef struct lb_calendar_context_t lb_calendar_context_t;
 
@@ -6065,6 +6065,20 @@ typedef struct lb_order_detail_t {
   struct CMultiLegInfo multi_leg;
 } lb_order_detail_t;
 
+/**
+ * Statement item
+ */
+typedef struct lb_statement_item_t {
+  /**
+   * Statement date (integer, e.g. 20250301)
+   */
+  int32_t dt;
+  /**
+   * File key
+   */
+  const char *file_key;
+} lb_statement_item_t;
+
 /**
  * Response for submit grid trading order request
  */
@@ -11862,17 +11876,17 @@ void lb_alert_context_delete(const struct lb_alert_context_t *ctx,
  * @param config  Config object
  * @return A new asset context
  */
-const struct CAssetContext *lb_asset_context_new(const struct lb_config_t *config);
+const struct lb_asset_context_t *lb_asset_context_new(const struct lb_config_t *config);
 
 /**
  * Retain the asset context (increment reference count)
  */
-void lb_asset_context_retain(const struct CAssetContext *ctx);
+void lb_asset_context_retain(const struct lb_asset_context_t *ctx);
 
 /**
  * Release the asset context (decrement reference count)
  */
-void lb_asset_context_release(const struct CAssetContext *ctx);
+void lb_asset_context_release(const struct lb_asset_context_t *ctx);
 
 /**
  * Get statement data list
@@ -11884,7 +11898,7 @@ void lb_asset_context_release(const struct CAssetContext *ctx);
  * @param callback        Async callback
  * @param userdata        User data passed to the callback
  */
-void lb_asset_context_statements(const struct CAssetContext *ctx,
+void lb_asset_context_statements(const struct lb_asset_context_t *ctx,
                                  int32_t statement_type,
                                  int32_t start_date,
                                  int32_t limit,
@@ -11899,7 +11913,7 @@ void lb_asset_context_statements(const struct CAssetContext *ctx,
  * @param callback  Async callback
  * @param userdata  User data passed to the callback
  */
-void lb_asset_context_download_url(const struct CAssetContext *ctx,
+void lb_asset_context_download_url(const struct lb_asset_context_t *ctx,
                                    const char *file_key,
                                    lb_async_callback_t callback,
                                    void *userdata);

cpp/CMakeLists.txt

@@ -6,6 +6,7 @@ set(SOURCES
     src/decimal.cpp
     src/agent_context.cpp
     src/alert_context.cpp
+    src/asset_context.cpp
     src/dca_context.cpp
     src/sharelist_context.cpp
     src/calendar_context.cpp

cpp/src/asset_context.cpp

@@ -1,4 +1,5 @@
 #include "asset_context.hpp"
+#include "longbridge.h"
 #include <algorithm>
 #include <iterator>
 
@@ -122,9 +123,8 @@ AssetContext::statement_download_url(
       Status status(res->error);
 
       if (status) {
-        auto resp = (const lb_statement_download_url_response_t*)res->data;
         StatementDownloadUrlResponse result;
-        result.url = resp->url;
+        result.url = (const char*)res->data;
 
         (*callback_ptr)(
           AsyncResult<AssetContext, StatementDownloadUrlResponse>(