Foam::IOobject         (             Foam::fvMesh::defaultRegion,             runTime.timeName(),             runTime,             Foam::IOobject::MUST_READ         ) 上述代码是摘抄自createMesh.H中进行fvMesh构造时用到的临时IOobject对象的构造代码。 Foam::fvMesh::defaultRegion的值为"region0",这一部分是作为该IOobject的name_成员; runTime.timeName(),返回的是的runTime的量纲部分dimensioned<scalar>的name_,这一部分是作为该IOobject的instance_c成员; runTime是作为该IOobject的db_成员; 在由该IOobject构造其它类时这些信息是非常有用的,比如objectRegistry类,regIOobject类等,现在举objectRegistry为例,其以IOobject为参数的构造如下: Foam::objectRegistry::objectRegistry (     const IOobject& io,     const label nIoObjects ) :     regIOobject(io),     HashTable<regIOobject*>(nIoObjects),     time_(io.time()),     parent_(io.db()),     dbDir_(parent_.dbDir()/local()/name()) {     writeOpt() = IOobject::AUTO_WRITE; }   从中可见,objectRegistry的三个成员变量:time_,parent_和dbDir_的初始化都是源自上面的IOobject,将代码展开,得到的三个成员变量的值分别如下: time_ = runTime parent_ = runTime dbDir_ = runTime.dbDir()//region0

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