chromium/third_party/perfetto/src/trace_processor/perfetto_sql/intrinsics/functions/sql_function.h

/*
 * Copyright (C) 2023 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef SRC_TRACE_PROCESSOR_PERFETTO_SQL_INTRINSICS_FUNCTIONS_SQL_FUNCTION_H_
#define SRC_TRACE_PROCESSOR_PERFETTO_SQL_INTRINSICS_FUNCTIONS_SQL_FUNCTION_H_

#include <sqlite3.h>
#include <memory>

#include "perfetto/base/status.h"
#include "perfetto/trace_processor/basic_types.h"

namespace perfetto {
namespace trace_processor {

// Prototype for a C++ function which can be registered with SQLite.
//
// Usage
//
// Define a subclass of this struct as follows:
// struct YourFunction : public SqlFunction {
//   // Optional if you want a custom context object (i.e. an object
//   // passed in at registration time which will be passed to Run on
//   // every invocation)
//   struct YourContext { /* define context fields here */ };
//
//   static base::Status Run(/* see parameters below */) {
//     /* function body here */
//   }
//
//   static base::Status Cleanup(/* see parameters below */) {
//     /* function body here */
//   }
// }
//
// Then, register this function with SQLite using RegisterFunction (see below);
// you'll likely want to do this in TraceProcessorImpl:
// RegisterFunction<YourFunction>(/* see arguments below */)
struct SqlFunction { … };

}  // namespace trace_processor
}  // namespace perfetto

#endif  // SRC_TRACE_PROCESSOR_PERFETTO_SQL_INTRINSICS_FUNCTIONS_SQL_FUNCTION_H_