bits/stdc++.h头文件总结
目錄
頭文件使用方法
頭文件內(nèi)容
VS里面使用#include的方法
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在看一個(gè)浙大大佬的比賽答案時(shí),發(fā)現(xiàn)了這么一個(gè)頭文件,在C++中引用很廣泛。然后查了以下,總結(jié)一下。
#include <bits/stdc++.h>了解發(fā)現(xiàn)它是C++中支持的一個(gè)幾乎萬(wàn)能的頭文件,幾乎包含所有的可用到的C++庫(kù)函數(shù)。以后寫(xiě)代碼就可以直接引用這一個(gè)頭文件了,不需要在寫(xiě)一大堆vector、string、map、stack、、、、。
頭文件使用方法
#include <bits/stdc++.h>using namespace std;int main() { _return 0; }下面附上該頭文件的詳細(xì)內(nèi)容:
頭文件內(nèi)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> #endifVS里面使用#include<bits/stdc++.h>的方法
新建一個(gè)bits文件夾,里面新建一個(gè)名叫stdc++.h的頭文件,然后把上面的stdc++.h源文件復(fù)制進(jìn)去保存:
在這個(gè)路徑下Microsoft Visual Studio2017\2017\Enterprise\VC\Tools\MSVC\14.16.27023\include新建bits文件夾;然后在bits文件夾新建stdc++.h文件。
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編譯時(shí)間慢,具有不可移植的問(wèn)題,很多編譯器和oj不支持,雖然現(xiàn)在noip支持了...
如果你用了bits/stdc++.h,那么你很大幾率就會(huì)用using namespace std;而不是using std::cin; using std::cout;這樣的。這會(huì)導(dǎo)致你的某些變量或函數(shù)已經(jīng)被包含了而你不知道(關(guān)鍵字作為函數(shù)名)
還有很重要的一點(diǎn),就是用bits很占內(nèi)存,某些卡內(nèi)存的題根本用不了
總結(jié)
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