概要

VSCodeでC++のAtCoder環境を整備していたときに、bits/stdc++.hが認識されなかったときの対処法のメモ。

環境

Windows10
Visual Studio Codeで競プロ環境構築(導入編)で環境構築。

状況

以前にVisual Studio Codeで競プロ環境構築(導入編)で環境構築を行ったが、久しぶりにVSCodeを開いてみたところ、#include <bits/stdc++.h>で「IncludePathを更新してください」と怒られた。コンパイルは通るのでGCCではなく、VSCode側の問題のようだ。

解決方法

c_cpp_properties.jsonのIncludePathにbitsのパスを追加。

「Ctrl + Shift + P」でコマンドパレットを開く。
「C/Cpp: Edit configurations...」を選択。
includePathにbitsのパスを追加。

c_cppproperties.json

"includePath": [
    "${workspaceFolder}/**",
    "C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.25.28610/include/bits/*" // この行を追加
],

※「.vscode」フォルダの中に「c_cpp_properties.json」ファイルが作成される。
「.vscode」というフォルダが無い場合は、プロジェクトフォルダ直下に自動で作成される。

bitsのパスに「stdc++.h」ファイルを追加。

stdc++.hの内容はここから。

stdc++.h

// 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
// <http://www.gnu.org/licenses/>.

/** @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 <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

まとめ

該当部分の波線エラーを消すことができた。
そもそも何で波線エラーがでてしまったのかは不明のまま。

参考

bits/stdc++.hがよくわかっていなかったので勉強になった。
で、結局 #include って何?
同様の内容の記事があったが探すのにだいぶ時間がかかった。
Visual Studio Codeにbits/stdc++.hを認識させる