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（18）C++14 智能指针及引用计数*
（19）C++14 多线程pthread*
（20）C++14 同步锁mutex*
（23）C++14 循环语句
（24）C++中的计时与等待*
（25）C++中的高精度计算*
（27）C++14 std::string*
（31）C++高级技能*
for-loop:
------------------------------------------------------------------
for(int i=0;i<100;i++){
std::cout<<i<<" ";
}
std::cout<<std::endl;
------------------------------------------------------------------
for-each-loop:
------------------------------------------------------------------
for(auto &item:vectorVal){
std::cout<<item<<std::endl;
}
for(auto& pair:mapVal){
std::cout<<pair.first<<" "<<pair.second<<std::endl;
}
------------------------------------------------------------------
while-loop
------------------------------------------------------------------
while(true){
std::cout<<"looping"<<std::endl;
if(needExitLoop){
break;
}
}
------------------------------------------------------------------
do-while-loop
------------------------------------------------------------------
int count=1;
do{
std::count<<"count::::"<<count<<endl;
--count;
}while(count>0);
------------------------------------------------------------------