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std::memory_order - cppreference.com
typedef enum memory_order { memory_order_relaxed, memory_order_consume, memory_order_acquire, memory_order_release, memory_order_acq_rel, memory_order_seq_cst } memory_order; enum class memory_order : /* unspecified */ { relaxed, consume, acquire, release, acq_rel, seq_cst }; inline constexpr memory_order memory_order_relaxed = memory_order::relaxed; inline constexpr memory_order memory_order_cons
C++ã®which is of non-class typeã«ãƒãƒžã‚‹ - ãªãœã‹æ•°å¦è€…ã«ã¯ãƒ¯ã‚¤ãƒ³å¥½ããŒå¤šã„
c++ã®stringクラスã¨æ–‡å—列ãƒã‚¤ãƒ³ã‚¿ã®é–¢ä¿‚ã«ã¤ã„ã¦èª¿ã¹ã¦ã„ãŸã‚ã‘ã§ã™ã‚ˆï¼Ž #include <iostream> using namespace std; class Color { string color; public: Color(string a) { cout<<"Color"<<endl; color = a; } void echo() { cout<<color<<endl; } ~Color() { } }; int main(int argc, char *argv[]){ Color c(string(argv[1])); c.echo(); return(0); }ã“ã‚“ãªãƒ—ãƒã‚°ãƒ©ãƒ ã§ï¼Œå¼•æ•°ã§ä¸ŽãˆãŸæ–‡å—列ãŒè¡¨ç¤ºã•ã‚Œã‚‹ã®ã‚’期待ã—ã¾ã—ãŸï¼Žã¨ã“ã‚㌠$ c++ test.cc test.cc: In function 'int main(int, char**)':
try-and-back-off アルゴリズム- melpon日記 - Haskellã‚‚C++ã‚‚ã¾ã¨ã‚‚ã«æ‰±ãˆãªã„ã¸ãŸã‚Œã®ãƒšãƒ¼ã‚¸
C++11 ã«ã¯ã€è¤‡æ•°ã® Lockable ãªã‚ªãƒ–ジェクトをãƒãƒƒã‚¯ã—ã¦ãれる std::lock 関数ãŒã‚ã‚Šã¾ã™ã€‚ template<class L1, class L2, class... L3> void lock(L1& m1, L2& m2, L3&... m3); ã“ã®é–¢æ•°ã®æœ€å¤§ã®ç‰¹å¾´ã¯ã€æ±ºã—ã¦ãƒ‡ãƒƒãƒ‰ãƒãƒƒã‚¯ã—ãªã„ã“ã¨ã§ã™ã€‚ ãã—ã¦ã€ã“ã®ãƒ‡ãƒƒãƒ‰ãƒãƒƒã‚¯ã—ãªã„ã¨ã„ã†è¦ä»¶ã‚’満ãŸã™ãŸã‚ã«ä½¿ã‚れるアルゴリズムãŒã€try-and-back-off アルゴリズムã¨å‘¼ã°ã‚Œã‚‹ã‚‚ã®ã§ã™ã€‚ 今回ã¯ã“ã® try-and-back-off アルゴリズムã«ã¤ã„ã¦èª¬æ˜Žã—ã¾ã™ã€‚ （ã“ã®è¨˜äº‹ã«ã¯ç‹¬è‡ªè§£é‡ˆãŒå«ã¾ã‚Œã¦ã„ã‚‹ã®ã§ã€é–“é•ã£ã¦ã‚‹éƒ¨åˆ†ã¨ã‹ã‚ã‚Œã°æŒ‡æ‘˜ã—ã¦é ‚ã‘ã‚‹ã¨å¬‰ã—ã„ã§ã™ï¼‰ デッドãƒãƒƒã‚¯ã®æ¡ä»¶ デッドãƒãƒƒã‚¯ã¯ã€æ£ç¢ºã§ã¯ãªã„ã§ã™ãŒã€å¤§ã¾ã‹ã«è¨€ã£ã¦ä»¥ä¸‹ã®æ¡ä»¶ã‚’満ãŸã™ã¨ç™ºç”Ÿã—ã¾ã™ã€‚ ãƒãƒƒã‚¯ã‚’å–å¾—ã™ã‚‹ãŸã‚ã«å¾…æ©Ÿã‚’è¡Œãªã† ã‚
Big Sky :: C言語ã‹ã‚‰ä½¿ãˆã‚‹JSONパーサã€JSMNを試ã—ã¦ã¿ãŸã€‚
上記ã®æ§˜ã«ã€ãƒˆãƒ¼ã‚¯ãƒ³ã¯å„è˜åˆ¥æ¯Žã«ä½œã‚‰ã‚Œã¾ã™ã€‚オブジェクトã®ã‚ーãŠã‚ˆã³å€¤ã‚‚ãã‚Œãžã‚Œã®ãƒˆãƒ¼ã‚¯ãƒ³ã¨ã—ã¦æ ¼ç´ã•ã‚Œã¾ã™ã€‚ jsmn_parse ã¯ãƒˆãƒ¼ã‚¯ãƒ³ã®é‡ãŒä¸è¶³ã—ã¦ã„ã‚‹å ´åˆã€ã‚¨ãƒ©ãƒ¼ JSMN_ERROR_NOMEM ã‚’è¿”ã—ã¾ã™ã€‚例ãˆã°ã€ã©ã‚Œã ã‘ã®é‡ã®ãƒˆãƒ¼ã‚¯ãƒ³ãŒ JSON æ–‡å—列ã¨ã—ã¦ä¸Žãˆã‚‰ã‚Œã‚‹ã‹åˆ†ã‹ã‚‰ãªã„å ´åˆã€ãƒˆãƒ¼ã‚¯ãƒ³ã®ã‚µã‚¤ã‚ºã‚’広ã’ã‚‹å¿…è¦ãŒã‚ã‚Šã¾ã™ã€‚ã“ã®å ´åˆã€jsmn ã§ã¯ãƒ‘ーサをå†åˆæœŸåŒ–ã™ã‚‹äº‹ãªã—ã«ã€ãƒˆãƒ¼ã‚¯ãƒ³ã‚’広ã’ã¦å†åº¦ jsmn_parse を実行ã™ã‚‹äº‹ã§ãƒ‘ースを続行出æ¥ã‚‹æ§˜ã«ãªã£ã¦ã„ã¾ã™ã€‚ ãŸã ã—ã©ã‚Œã ã‘ã®é‡ãŒä¸è¶³ã—ã¦ã„ãŸã‹ã¯åˆ†ã‹ã‚‰ãªã„ã®ã§ã€é©åº¦ãªå¢—減を考慮ã™ã‚‹å¿…è¦ãŒã‚ã‚Šã¾ã™ã€‚ 今日ã¯è©¦ã—ã« twitter ã®ãƒ‘ブリックタイムラインをパースã—ã¦ã¿ã¾ã—ãŸã€‚ #include <assert.h> #include <string.h> #include <memory.h> #include
Lemon Parser Generator - Practice - Code Style No.7
Code Style No.7 トップページページ一覧メンãƒãƒ¼ç·¨é›† Lemon Parser Generator - Practice 最終更新： csn7 2011å¹´03月07æ—¥(月) 18:28:35å±¥æ´ Tweet Lemon Parser GeneratorãŒç”Ÿæˆã—ãŸCコードをヘッダオンリーã®ãƒ‘ーサã¨ã—ã¦æä¾›ã™ã‚‹ã«ã¯ã©ã†ã—ãŸã‚‰è‰¯ã„ã‹ã®ã¾ã¨ã‚。Lemon自体ã¨ãƒ†ãƒ³ãƒ—レートã«ã¯æ‰‹ã‚’åŠ ãˆãªã„縛り。ãªãŠã€ä¾‹é¡Œã¯å››å‰‡æ¼”ç®—ã§ã€Boost.Variantを生æˆã™ã‚‹ï¼ˆã‚¹ã‚ャナã¯ãªã—）。 関連記事ã¯ä¸‹è¨˜ã€‚ Boost.Variant - recursive (4) Header Only Lemon (1) Header Only Lemon (2) Lemon - malloc and realloc ã¾ãšã¯æ–‡æ³•ãƒ•ã‚¡ã‚¤ãƒ«ã€‚ %token_prefix MORLA_EXAMPLE_PARSER_ %
caper -- LALR(1) パーサジェãƒãƒ¬ãƒ¼ã‚¿
caperã¨ã¯ modernã§ã‚¯ãƒªãƒ¼ãƒ³ãªC++コードを出力ã™ã‚‹LALR(1)パーサジェãƒãƒ¬ãƒ¼ã‚¿ã§ã™ã€‚ ãŠã¾ã‘ã§JavaScript/C#/D用ã®ãƒ‘ーサも出力ã§ãã¾ã™ã€‚ ニュース・履æ´ã¯ãƒ€ã‚¦ãƒ³ãƒãƒ¼ãƒ‰ã®ãƒšãƒ¼ã‚¸ã§ã€‚ コンセプト caperã§å‡ºåŠ›ã—ãŸãƒ‘ーサã®ã‚³ãƒ¼ãƒ‰ã‚’ä»–ã®ãƒ—ãƒã‚¸ã‚§ã‚¯ãƒˆã¨æ··ãœã¦ã€Œæ‰‹æ›¸ãã®ãƒ‘ーサã§ã™ãŒãªã«ã‹ï¼Ÿã€ ã¨å¼·å¼ã§ãã‚‹ã®ãŒç†æƒ³ã€‚ æ ¼é—˜ã‚²ãƒ¼ãƒ ã®ã‚³ãƒžãƒ³ãƒ‰è§£æžã«ä½¿ãˆã‚‹ãらã„使ã„ã‚„ã™ãï¼ ãŸã¨ãˆã°ï¼Ÿ ã“ã‚“ãªæ„Ÿã˜ã®å…¥åŠ›ãƒ•ã‚¡ã‚¤ãƒ«ãŒ %token Number<int> Add Sub Mul Div; %namespace calc; %dont_use_stl; Expr<int> : [Identity] Term(0) | [MakeAdd] Expr(0) Add Term(1) | [MakeSub] Expr(0) Sub Term(1) ; Term<int> : [Identi
é »åº¦è¨ˆæ•°ã«ãŠã‘ã‚‹ unordered_map ã®èª¿æ•´ï¼ˆC++） - ã‚„ãŸï¼ ã¯ã¦ãªæ—¥è¨˜
å½¢æ…‹ç´ ã®é »åº¦ã‚’カウントã™ã‚‹ã¨ã„ã†ã‚·ãƒ³ãƒ—ルãªã‚¿ã‚¹ã‚¯ã§ std::tr1::unordered_map ã®æ€§èƒ½ã«ã¤ã„ã¦å®Ÿé¨“ã—ã¦ã¿ã¾ã—ãŸï¼Žstd::string より const char * ã®æ–¹ãŒãƒ¡ãƒ¢ãƒªã‚’節約ã§ãã‚‹ã¨ã„ã†ã‚ˆã†ãªè»½ã„内容ã§ã™ï¼Ž å®Ÿé¨“æ¦‚è¦ å®Ÿé¨“ç’°å¢ƒã¯ä»¥ä¸‹ã®ã¨ãŠã‚Šã§ã™ï¼Ž 実験環境 CPU：Core 2 Duo U9600 1.60GHz コンパイラ：gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5) 入力ã¨ã—ã¦ä½¿ç”¨ã—ãŸã®ã¯ï¼Œã‚¦ã‚§ãƒ–コーパスã‹ã‚‰æŠ½å‡ºã—ãŸå½¢æ…‹ç´ を改行区切りã§ä¿å˜ã—ãŸãƒ•ã‚¡ã‚¤ãƒ«ã§ã™ï¼Ž 入力 サイズ：815,793,701 bytes å½¢æ…‹ç´ æ•°ï¼š133,940,786 ç•°ãªã‚Šæ•°ï¼š516,612 å½¢æ…‹ç´ ã®å…¥åŠ›ã«ã¤ã„ã¦ã¯ï¼Œstd::ios::sync_with_stdio(false) を呼ã³å‡ºã—ãŸå¾Œã§ std::getline() を使ã†ã‚ˆã†ã«ã—
C++ã§synchronized methodを書ãã®ã¯é›£ã—ã„ (3) - memologue
æ–¹å¼cã®æ”¹è‰¯ã§ã™ã€‚ã¾ãšã€ã€ŒåˆæœŸåŒ–é †ã€ã®å•é¡Œã‚’é¿ã‘ã‚‹ãŸã‚ã«ã¯ã€ã‚³ãƒ³ã‚¹ãƒˆãƒ©ã‚¯ã‚¿ã‚’呼ã³å‡ºã™ã“ã¨ãªãåˆæœŸåŒ–ãŒæ¸ˆã‚“ã§ã„るオブジェクトã§ãªã‘ã‚Œã°ãªã‚Šã¾ã›ã‚“。ãã®ãŸã‚ã«ã¯ã€mutexオブジェクトを // 方法c' (ä»®) void Foo::need_to_sync(void) { static StaticMutex mutex = { PTHREAD_MUTEX_RECURSIVE_INITIALIZER_NP, ........ };ã®ã‚ˆã†ã«åˆæœŸåŒ–ã§ããªã‘ã‚Œã°ãªã‚Šã¾ã›ã‚“。一般的ãªC++ã®ã‚¯ãƒ©ã‚¹ã¯ã“ã†ã„ã†å½¢ã®åˆæœŸåŒ–ã¯è¨±ã•ã‚Œã¾ã›ã‚“。ã“ã®ã‚ˆã†ãªåˆæœŸåŒ–を実ç¾ã™ã‚‹ãŸã‚ã«ã¯ã€ä¸Šè¨˜StaticMutexクラスã¯PODåž‹ã§ãªã‘ã‚Œã°ãªã‚Šã¾ã›ã‚“。PODåž‹ã¨ã„ã†ã®ã¯ã€è¦æ ¼ã«ã‚ˆã‚‹ã¨ コンストラクタãŒã‚ã£ã¦ã¯ãƒ€ãƒ¡ デストラクタãŒã‚ã£ã¦ã¯ãƒ€ãƒ¡ コピーコンストラクタã€ä»£å…¥æ¼”ç®—åã¯ã‚³ãƒ³ãƒ‘イラãŒç”Ÿæˆã—ãªã„ã¨ãƒ€ãƒ¡ private,
recursive mutex - hidemonã®ãƒ–ãƒã‚°
mutexã¯ã‚¹ãƒ¬ãƒƒãƒ‰é–“ã®æŽ’他処ç†ã‚’ã™ã‚‹ãŸã‚ã®æ©Ÿæ§‹ã ãŒï¼Œä¸€èˆ¬çš„ãªthreadライブラリã®ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆã®mutexã«ã¯å¤§ããªå•é¡ŒãŒã‚る．ã‚ã‚‹mutexã‚’æ—¢ã«lockã—ã¦ã„ã‚‹threadãŒå†åº¦åŒã˜mutexã‚’lockã—よã†ã¨ã™ã‚‹ã¨ãƒ–ãƒãƒƒã‚¯ã—ã¦ã—ã¾ã†ã®ã ．ãŸã¨ãˆã°ï¼Œthread bufferã®ä¾‹ã§ï¼Œemptyを判定ã™ã‚‹éƒ¨åˆ†ã‚’別メソッドã«ã—ã¦ï¼Œã“ã¡ã‚‰ã‚‚lockã‚’ã‹ã‘るよã†ã«æ›¸ãç›´ã—ã¦ã¿ã‚‹ï¼Ž class buffer { list<int> queue; boost::condition_variable cond; boost::mutex mut; public: bool empty() { boost::lock_guard<boost::recursive_mutex> lock(mut); return queue.empty(); } ... int pop() throw(out_of_
C++ ã§lexer/parserã‚’ã‹ããªã‚‰ re2c+lemon ãŒã‚ªã‚¹ã‚¹ãƒ¡ãªä»¶ - tokuhirom's blog
yacc ã‚„ lex ã‚’ã¤ã‹ã£ã¦ã„ã¦ã‚‚「ãªã‚“ã‹ã‚ˆãã‚ã‹ã‚‰ã‚“ã‘ã©ã†ã”ãã€ã¨ã„ã†çŠ¶æ…‹ã«ãªã‚ŠãŒã¡ã ã£ãŸã‚Šã€ã‚°ãƒãƒ¼ãƒãƒ«å¤‰æ•°ã«ã¾ã¿ã‚ŒãŸã‚Šã—ãŒã¡ã ãŒã€re2c + lemon ã ã¨ãã®ã¸ã‚“ãŒã™ã£ãã‚Šã™ã‚‹ã€‚ レã‚サを以下ã®ã‚ˆã†ã«ã‹ã。yyfill を自å‰ã§ã‹ã‹ãªã‘ã‚Œã°ã„ã‘ãªã„ã®ãŒã¡ã‚‡ã£ã¨é¢å€’ã ãŒã€ã“ã®ã‚ˆã†ãªã‚¯ãƒ©ã‚¹ã‚’手軽ã«ã‹ã‘ã‚‹ã®ã¯ã‚„ã¯ã‚Šä¾¿åˆ©ã§ã‚る。flex ã§ã¯ã“ã†ã¯ã„ã‹ãªã„ã®ã 。 #ifndef CALC_SCANNER_H_ #define CALC_SCANNER_H_ #include <stdio.h> #include <string.h> #include <string> #include <sstream> #include <vector> #include <iostream> #include <fstream> #include "scanner.def.h" #include
GitHub - tanakh/cmdline: A Command Line Parser
This is an example of simple usage. // include cmdline.h #include "cmdline.h" int main(int argc, char *argv[]) { // create a parser cmdline::parser a; // add specified type of variable. // 1st argument is long name // 2nd argument is short name (no short name if '\0' specified) // 3rd argument is description // 4th argument is mandatory (optional. default is false) // 5th argument is default value
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#4936 (cannot find boost_system-mt) – Boost C++ Libraries
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3.1 shared_ptr | æ ªå¼ä¼šç¤¾ãã˜ãã“
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