原文地址: 【C++】头文件 bits/stdc++.h 是啥?
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嘿嘿, 当前写 leetcode 的话, 本地间接就援用这个文件, 还是很不便的;然而因为不可移植以减少编译工夫等, 墙裂倡议不要在生产环境应用.
引言
最近看他人的 C++ 代码, 发现了这么一个头文件:
#include <bits/stdc++.h>而后我就有点奇怪了, 以前如同没有遇到过呀, 而后这个 C++ 头文件也比拟特地, 是以 .h 结尾的, 于是乎打算一探到底.
它是 C++ 中反对的一个简直万能的头文件, 简直蕴含所有的可用到的 C++ 库函数. 当前写代码就能够间接援用这一个头文件了, 不须要在写一大堆 vector, string, map, stack 等等
应用办法
#include <bits/stdc++.h>int main() { // write code here return 0}头文件的内容
// C++ includes used for precompiling -*- C++ -*-// Copyright (C) 2003-2013 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// <Licenses - GNU Project - Free Software Foundation>./** @file stdc++.h * This is an implementation file for a precompiled header. */// 17.4.1.2 Headers// C#ifndef _GLIBCXX_NO_ASSERT#include <cassert>#endif#include <cctype>#include <cerrno>#include <cfloat>#include <ciso646>#include <climits>#include <clocale>#include <cmath>#include <csetjmp>#include <csignal>#include <cstdarg>#include <cstddef>#include <cstdio>#include <cstdlib>#include <cstring>#include <ctime>#if __cplusplus >= 201103L#include <ccomplex>#include <cfenv>#include <cinttypes>#include <cstdalign>#include <cstdbool>#include <cstdint>#include <ctgmath>#include <cwchar>#include <cwctype>#endif// C++#include <algorithm>#include <bitset>#include <complex>#include <deque>#include <exception>#include <fstream>#include <functional>#include <iomanip>#include <ios>#include <iosfwd>#include <iostream>#include <istream>#include <iterator>#include <limits>#include <list>#include <locale>#include <map>#include <memory>#include <new>#include <numeric>#include <ostream>#include <queue>#include <set>#include <sstream>#include <stack>#include <stdexcept>#include <streambuf>#include <string>#include <typeinfo>#include <utility>#include <valarray>#include <vector>#if __cplusplus >= 201103L#include <array>#include <atomic>#include <chrono>#include <condition_variable>#include <forward_list>#include <future>#include <initializer_list>#include <mutex>#include <random>#include <ratio>#include <regex>#include <scoped_allocator>#include <system_error>#include <thread>#include <tuple>#include <typeindex>#include <type_traits>#include <unordered_map>#include <unordered_set>#endif长处与毛病
起源: bits/stdc++.h in C++
bits/stdc++ 的毛病
- bits/stdc++.h 是 GNU C++ 库的非标准头文件. 因而, 如果您尝试应用 GCC 以外的其余编译器编译代码, 它可能会失败;例如,MSVC 没有此标头.
- 应用它会蕴含很多不必要的货色并减少编译工夫.
- 此头文件不是 C++ 规范的一部分, 因而不可移植, 应防止应用.
- 此外, 即便规范中有一些无所不包的标头, 您也心愿防止应用它来代替特定标头, 因为编译器必须每次都理论读取并解析每个蕴含的标头 (包含递归蕴含的标头) 编译单元.
bits/stdc++的长处
- 在较量中, 当你想缩小节约在做家务上的工夫时, 应用这个文件是个好主见;尤其是当您的排名对工夫敏感时.
- 这也缩小了编写所有必要的头文件的所有琐事.
- 您不用为应用的每个函数记住所有 GNU C++ 的 STL.
原文地址: 【C++】头文件 bits/stdc++.h 是啥?
欢送拜访我的博客:http://blog.duhbb.com/