int *x = 0;
int& y = *x;
榪欎袱琛岃鍙ヤ細寮曡搗涓涓閿欒int& y = *x;
鍒榪斿洖灞閮ㄥ彉閲忕殑寮曠敤涔熸槸鏃犳晥鐨?br>
int& getLocalVariable()
{
int x;
return x;
}
{
int x;
return x;
}
]]>
Lockable Concept
TimedLockable Concept
SharedLockable Concept
UpgradeLockable Concept
浜掓枼浣撳璞″彲浠ヤ繚鎶ょ珵璧涚殑鏁版嵁鍜屼笉鍚岀嚎紼嬮棿鐨勫畨鍏ㄧ嚎紼嬪悓姝?綰跨▼鍙互璋冪敤浜掓枼浣撶殑鎴愬憳鍑芥暟lock()鏉ュ彇寰椾簰鏂ヤ綋鐨勬墍鏈夋潈,unlock()閲婃斁鎵鏈夋潈.鍦˙oost::thread涓?浜掓枼浣撳彲浠ラ掑綊浣跨敤,鍏佽鍑犱釜綰跨▼鍚屾椂鎷ユ湁浜掓枼浣撶殑鎵鏈夋潈.TimedLockable Concept
SharedLockable Concept
UpgradeLockable Concept
Lockable
姒傚康 void lock() //
bool try_lock()//
void unlock()
Lockable鐨勫疄鐜扮被蹇呴』鎻愪緵浠ヤ笂鍑芥暟.閫氳繃璋冪敤lock()鑾峰緱鎵鏈夋潈,unlock()閲婃斁鎵鏈夋潈. boost::thread_resource_error if an error
occurs
bool try_lock()//
boost::thread_resource_error if an error
occurs.
void unlock()
TimedLockable
姒傚康 bool timed_lock(boost::system_time const& abs_time)
template<typename DurationType> bool timed_lock(DurationType const& rel_time
//
template<typename DurationType> bool timed_lock(DurationType const& rel_time
//
boost::thread_resource_error if an error
occurs.
TimedLockable
姒傚康綺劇粌浜?a class="link" title="Lockable Concept">Lockable 鏀寔瓚呮椂灝濊瘯鑾烽攣,TimedLockable
鐨勫疄鐜扮被闄や簡瀹炵幇Lockable綾葷殑鎴愬憳澶?榪樿瀹炵幇涓婇潰涓や釜鍑芥暟. SharedLockable
姒傚康 void lock_shared()
bool try_lock_shared()
bool timed_lock_shared(boost::system_time const& abs_time)
void unlock_shared()
bool try_lock_shared()
bool timed_lock_shared(boost::system_time const& abs_time)
void unlock_shared()
SharedLockable
綺劇粌浜嶵imedLockable,鐢ㄤ簬鎻愪緵鍏變韓鎵鏈夋潈 UpgradeLockable姒傚康
void lock_upgrade()
void unlock_upgrade()
void unlock_upgrade_and_lock()
void unlock_upgrade_and_lock_shared()
void unlock_and_lock_upgrade()
UpgradeLockable姒傚康鏄竴涓畬鍠凷haredLockable姒傚康錛屽彲浠ュ崌綰х殑鎵鏈夋潈錛屼互鍙婂叡鍚岀殑鎵鏈夋潈鍜岀嫭鑷嫢鏈夈傝繖鏄竴涓墿澶у埌澶氳
鑰?鍗曞啓妯″紡鎵鎻愪緵鐨凷haredLockable姒傚康錛氫竴涓崟涓鐨勭嚎紼嬪彲鑳藉崌綰ф墍鏈夋潈鐨勫悓鏃訛紝鍏朵粬鏈夊叡鍚岀殑鎵鏈夋潈銆傜嚎紼嬫墍鏈夋潈鍙殢鏃跺崌綰э紝 灝濊瘯鎷ユ湁鐙鎵鏈夋潈銆傚鏋滄病鏈夊叾浠栫嚎紼嬫湁鍏卞悓鐨勬墍鏈夋潈錛屽崌綰у畬鎴愶紝绔嬪嵆鍜岀嚎紼嬬幇鍦ㄧ嫭瀹舵嫢鏈夛紝瀹冨繀欏繪斁寮冭姹傝В閿侊紙錛変竴鏍鳳紝濡傛灉瀹冭鏀惰喘錛屽懠鍚侀攣錛堬級
銆?
void unlock_upgrade()
void unlock_upgrade_and_lock()
void unlock_upgrade_and_lock_shared()
void unlock_and_lock_upgrade()
Class template lock_guard
lock_guard(Lockable & m)
lock_guard(Lockable & m,boost::adopt_lock_t)
~lock_guard()
lock_guard(Lockable & m)
lock_guard(Lockable & m,boost::adopt_lock_t)
~lock_guard()
]]>
]]>
"Evil does seek to maintain power by suppressing the truth."
"Or by misleading the innocent."
褰掓牴緇撳簳,鎵鏈夐棶棰橀兘鏄垪琛?鎴栨墍鏈夐棶棰橀兘鏄畻娉?br>
闂絀洪棿鐨勫厓绱犲悓瀹冨湪絀洪棿鐨勮〃榪扮О涔嬩負瀵硅薄
涓囩墿鐨嗗璞?br>
紼嬪簭灝辨槸涓緇勫璞?鍛婅瘔瀵規柟璇ュ仛浠涔?br>
姣忎釜瀵硅薄閮藉埄鐢ㄥ埆鐨勫璞℃潵緇勫緩鑷繁鐨勮蹇?br>
瀵硅薄閮芥湁綾誨瀷
鎵鏈夊睘浜庡悓涓綾誨瀷鐨勫璞￠兘鑳芥帴鍙楃浉鍚岀殑娑堟伅
鎺ュ彛鍙浣犺兘鍚戣繖涓璞″彂閫佷粈涔堟秷鎭?br>
瀹炵幇闅愯棌鑳藉噺灝戠▼搴忕殑bug
緇ф壙: 澶嶇敤鎺ュ彛
鍦ㄦ柊綾諱腑淇敼鍩虹被鐨勮涓虹О涓鴻鍐?br>
"鍙鍐?鍩虹被鐨勮涓?縐頒負鏇挎崲瑙勫垯,鏄?is-a)鍏崇郴
鍦ㄦ淳鐢熺被涓坊鍔犳柊鎺ュ彛鏄?is-like-a)鍏崇郴
澶氭佹浛鎹㈠璞″彲浠ラ檷浣庣淮鎶よ蔣浠舵垚鏈拰澧炲己璁捐
OPP璇█閲囩敤鍚庣粦瀹氱殑姒傚康.
鍔ㄦ佺粦瀹氭槸JAVA鐨勭己鐪佽涓?br>
interface鏄痑bstract鐨勬繁鍖?br>
]]>
struct callable
{
void operator()();
};
濡傛灉璇ョ被蹇呴』涓嶅彲澶嶅埗,閭ｄ箞鍙互鐢╞oost::ref浼犻掍竴涓狢allable瀵硅薄鐨勫紩鐢ㄥ埌鏋勯犱腑.{
void operator()();
};
boost::thread copies_are_safe()
{
callable x;
return boost::thread(x); //鍙傛暟涓篨鐨勪竴浠芥嫹璐?/span>
} // x is destroyed, but the newly-created thread has a copy, so this is OK
{
callable x;
return boost::thread(x); //鍙傛暟涓篨鐨勪竴浠芥嫹璐?/span>
} // x is destroyed, but the newly-created thread has a copy, so this is OK
boost::thread oops()
{
callable x;
return boost::thread(boost::ref(x)); //鍙傛暟涓篨鐨勫紩鐢?/span>
} // x is destroyed, but the newly-created thread still has a reference
// this leads to undefined behaviour
綰跨▼鍙互鐢ㄤ竴涓嚱鏁版垨callable瀵硅薄涓哄弬鏁版瀯閫?鐢╞oost::bind鏉ュ疄鐜?br>
{
callable x;
return boost::thread(boost::ref(x)); //鍙傛暟涓篨鐨勫紩鐢?/span>
} // x is destroyed, but the newly-created thread still has a reference
// this leads to undefined behaviour
void find_the_question(int the_answer);
boost::thread deep_thought_2(boost::bind(find_the_question,42));
void print();
boost::thread t=boost::thread(&print);
浜?綰跨▼鎺ュ悎涓庤劚紱?br>褰撹閿姣佹椂,綰跨▼縐頒負鑴辯(detached),褰撶嚎紼嬩負鑴辯(detached)鏃?綰跨▼緇х畫鎵ц鐩村埌鏋勯犲嚱鏁頒腑鍑芥暟鎴朿allable瀵硅薄鎵ц瀹屾瘯,鎴栫▼寮忕粓姝?boost::thread deep_thought_2(boost::bind(find_the_question,42));
void print();
boost::thread t=boost::thread(&print);
void print();
boost::thread t(&print);
t.join();//綰跨▼閿姣?/em>
t.join();//綰跨▼宸茬粡澶辨晥,t涓嶆寚鍚戜換浣曠嚎紼?鏃犱綔鐢?/em>
std::cout<<boolalpha<<t.joinable()<<std::endl;//print false statement
boost::thread t(&print);
t.join();//綰跨▼閿姣?/em>
t.join();//綰跨▼宸茬粡澶辨晥,t涓嶆寚鍚戜換浣曠嚎紼?鏃犱綔鐢?/em>
std::cout<<boolalpha<<t.joinable()<<std::endl;//print false statement
綰跨▼鐨勮劚紱誨彲浠ユ槑紜皟鐢╞oost::detach()鍑芥暟,榪欑鎯呭喌涓嬬嚎紼嬩負闈炵幇鑴辯綰跨▼(now-detached thread),鍙樹負闈炵嚎紼?Not-a-Thread).
boost::thread::join() //濡傛灉綰跨▼涓轟腑鏂?interrupted),寮曞彂boost::thread_interrupted寮傚父.
boost::thread::detach() //涓嶅紩鍙戝紓甯?濡傛灉綰跨▼涓嶈劚紱?綰跨▼鏋愭瀯鏃惰皟鐢?
boost::thread::detach() //涓嶅紩鍙戝紓甯?濡傛灉綰跨▼涓嶈劚紱?綰跨▼鏋愭瀯鏃惰皟鐢?
]]>