推薦一個開源輔助網(wǎng)站programcreek

開發(fā)中經(jīng)常遇到api如何使用，或者省略時間可以直接使用一些開源的代碼，programcreek很好的解決這個問題，這個網(wǎng)站可以提供最簡單的demo，快速獲知一個API的使用，開發(fā)中讓我們事半功倍，大家可以用用。

網(wǎng)站地址：https://www.programcreek.com/

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我們看看c++ code Examples

我們搜索一下state machine，看到找到了4 個與“狀態(tài)機”相關(guān)的 C++ 代碼示例，看看代碼寫的怎么樣 很多例子寫的很好，甚至可以直接使用。

void?ReplicationThread::CallbacksStateMachine::ConnEventCB(
????bufferevent?*bev,?int16_t?events,?void?*state_machine_ptr)?{
??if?(events?&?BEV_EVENT_CONNECTED)?{
????//?call?write_cb?when?connected
????bufferevent_data_cb?write_cb;
????bufferevent_getcb(bev,?nullptr,?&write_cb,?nullptr,?nullptr);
????if?(write_cb)?write_cb(bev,?state_machine_ptr);
????return;
??}
??if?(events?&?(BEV_EVENT_ERROR?|?BEV_EVENT_EOF))?{
????LOG(ERROR)?<"[replication]?connection?error/eof,?reconnect?the?master";
????//?Wait?a?bit?and?reconnect
????auto?state_m?=?static_cast(state_machine_ptr);
????state_m->repl_->repl_state_?=?kReplConnecting;
????std::this_thread::sleep_for(std::chrono::seconds(1));
????state_m->Stop();
????state_m->Start();
??}
}?

再看看C++ open source Projects

我們搜索一下state machine，看到有4個相關(guān)項目，還有分層有限狀態(tài)機框架HFSM2和高性能分層有限狀態(tài)機框架HFSM2。

我們點開HSFM

Basic?Usage
//?1.?Include?HFSM?header:
#include?

//?2.?Define?interface?class?between?the?FSM?and?its?owner
//????(also?ok?to?use?the?owner?object?itself):
struct?Context?{?/*?...?*/?};

//?3.?(Optional)?Typedef?hfsm::Machine?for?convenience:
using?M?=?hfsm::Machine;

//?4.?Define?states:
struct?MyState1?:?M::Bare?{
????//?5.?Override?some?of?the?following?state?functions:
????void?enter(Context&?_);
????void?update(Context&?_);
????void?transition(Control&?c,?Context&?_);
????void?leave(Context&?_);
};

struct?MyState2?:?M::Bare?{?/*?..?*/?};
struct?MySubState1?:?M::Bare?{?/*?..?*/?};
struct?MySubState2?:?M::Bare?{?/*?..?*/?};

struct?MyState3?:?M::Bare?{?/*?..?*/?};
struct?MyOrthogonalState1?:?M::Bare?{?/*?..?*/?};
struct?MyOrthogonalState2?:?M::Bare?{?/*?..?*/?};

//?6.?Declare?state?machine?structure:
using?MyFSM?=?M::PeerRoot<
????MyState1,
????M::Composite????????MySubState1,
????????MySubState2,
????>,
????M::Orthogonal????????MyOrthogonalState1,
????????MyOrthogonalState2,
????>
>;

int?main()?{
????//?7.?Create?context?and?state?machine?instances:
????Context?context;
????MyFSM?fsm(context);

????//?8.?Kick?off?periodic?updates:
????bool?running?=?true;
????while?(running)
????????fsm.update();

????return?0;
}

總的來說，這個programcreek很不錯，發(fā)現(xiàn)一些好的工具或者網(wǎng)站可以使我們開發(fā)效率提高，這也是我們站在巨人的肩膀上的意義。

???????????????? ?END ?????????????????