// Copyright (c) 2025 PaddlePaddle Authors. All Rights Reserved.
//
// 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.

#pragma once
#include <iostream>

/// @brief Defines a macro to disable log output.
/// @details This macro returns a `NullStream` object, and all content passed via `<<` is ignored.
///          It is designed to keep the code compilable without modifying log call statement.
/// @param level The log level (ignored).
class NullStream {
public:
    template <typename T>
    NullStream& operator<<(const T&) { return *this; }
};

#define VLOG(level) NullStream()