#include ＜cassert＞

<cassert> 是 C++ 标准库中的一个头文件，它提供了断言功能，用于在程序运行时检查条件是否为真。如果条件为假，程序将终止执行，并输出一条错误信息。断言主要用于调试阶段，以确保程序的逻辑正确性。

断言是一种调试工具，用于在开发过程中检查程序的运行状态。如果断言失败，程序将立即终止，这有助于开发者快速定位问题。

// -*- C++ -*- forwarding header.

// Copyright (C) 1997-2020 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file cassert
 *  This is a Standard C++ Library file.  You should @c \#include this file
 *  in your programs, rather than any of the @a *.h implementation files.
 *
 *  This is the C++ version of the Standard C Library header @c assert.h,
 *  and its contents are (mostly) the same as that header, but are all
 *  contained in the namespace @c std (except for names which are defined
 *  as macros in C).
 */

//
// ISO C++ 14882: 19.2  Assertions
//

// No include guards on this header...

#pragma GCC system_header

#include <bits/c++config.h>
#include <assert.h>

#include <cassert>

assert(expression);