No matching function for call

upc_ngh

在向DPMFoam求解器collision model中添加一个随机函数时出现下面错误，各位老老师帮忙看看：
添加的代码：

label seed;
Random randomNumber;//.H文件下的定义

volumeFactor_(1.0),
seed(1),
randomNumber(seed),//Constructors

 Info<< randomNumber.scalar01() << endl;//在一个函数里输出随机数

错误提示：

 error: no matching function for call to 'Foam::Random::scalar01() const'
     Info<< randomNumber.scalar01() << endl;

李东岳

加这个了么

#include "Random.H"

https://dev.tencent.com/u/dyfluid/p/Solvers_DYFLUID/git/blob/master/randomNumber/randomNumber.C

upc_ngh

添加了，在.H头文件上

星星星星晴

为什么
Foam::Random::scalar01() const 有个const？

upc_ngh

@星星星星晴这我也不明白，我找了它的原函数也不是const，不知道为啥后面莫名其妙就多了一个const

星星星星晴

@upc_ngh

 cachedRandom& rndGen = this->owner().rndGen();
YY = rndGen.sample01<scalar>() * 2.0 - 1.0 + ROOTVSMALL;

upc_ngh

@星星星星晴好的，多谢我用您这试试看

upc_ngh

@星星星星晴在 No matching function for call 中说：

cachedRandom& rndGen = this->owner().rndGen();

还是不行，一直在改，感觉调用一个很简单的函数，实现起来好难呀，昨天的方法和今天都编译不了，我把文件传上来pairCollision.zip ，哪位大佬帮忙看看

星星星星晴

@upc_ngh
晕他俩都不在一个class里怎么能互相调用呢。。
不确定能不能过，你试试看

template<class CloudType>
void Foam::PairSpringSliderDashpot<CloudType>::evaluatePair
(
    typename CloudType::parcelType& pA,
    typename CloudType::parcelType& pB
) const
{
	
cachedRandom& rndGen = this->owner().rndGen();
。
。
。
。

 scalar YY = rndGen.sample01<scalar>() * 2.0 - 1.0 + ROOTVSMALL;// I want to INfo the randomnumber everytime when I call this
 //evaluatePair function.
 Info<< "Random number = " << YY << endl


}

upc_ngh

@星星星星晴
好吧还是不太对，报错是下面的样子，我再试试看吧，这和课本上的C++是不太一样，多谢多谢

In file included from ./submodels/Kinematic/CollisionModel/PairCollision/PairModel/PairSpringSliderDashpot/PairSpringSliderDashpot.T.H:186:0,
                 from ./parcels/include/makeParcelCollisionModels.H:34,
                 from parcels/derived/basicKinematicCollidingParcel/makeBasicKinematicCollidingParcelSubmodels.C:34:
./submodels/Kinematic/CollisionModel/PairCollision/PairModel/PairSpringSliderDashpot/PairSpringSliderDashpot.T.C: In instantiation of 'void Foam::PairSpringSliderDashpot<CloudType>::evaluatePair(typename CloudType::parcelType&, typename CloudType::parcelType&) const [with CloudType = Foam::CollidingCloud<Foam::KinematicCloud<Foam::Cloud<Foam::CollidingParcel<Foam::KinematicParcel<Foam::particle> > > > >; typename CloudType::parcelType = Foam::CollidingParcel<Foam::KinematicParcel<Foam::particle> >]':
parcels/derived/basicKinematicCollidingParcel/makeBasicKinematicCollidingParcelSubmodels.C:50:58:   required from here
./submodels/Kinematic/CollisionModel/PairCollision/PairModel/PairSpringSliderDashpot/PairSpringSliderDashpot.T.C:301:45: error: passing 'const Foam::CollidingCloud<Foam::KinematicCloud<Foam::Cloud<Foam::CollidingParcel<Foam::KinematicParcel<Foam::particle> > > > >' as 'this' argument discards qualifiers [-fpermissive]
 cachedRandom& rndGen = this->owner().rndGen();
                                             ^
In file included from ./clouds/Templates/KinematicCloud/KinematicCloud.T.H:621:0,
                 from ./clouds/derived/basicKinematicCollidingCloud/basicKinematicCollidingCloud.H:36,
                 from parcels/derived/basicKinematicCollidingParcel/makeBasicKinematicCollidingParcelSubmodels.C:26:
./clouds/Templates/KinematicCloud/KinematicCloudI.T.H:359:28: note:   in call to 'Foam::cachedRandom& Foam::KinematicCloud<CloudType>::rndGen() [with CloudType = Foam::Cloud<Foam::CollidingParcel<Foam::KinematicParcel<Foam::particle> > >]'
 inline Foam::cachedRandom& Foam::KinematicCloud<CloudType>::rndGen()
                            ^
/home/ofuser/blueCFD/OpenFOAM-4.x/wmake/makefiles/general:251: recipe for target '/home/ofuser/blueCFD/OpenFOAM-4.x/platforms/mingw_w64GccDPInt32Opt/src/lagrangian/intermediate/makeBasicKinematicCollidingParcelSubmodels.o' failed
make: *** [/home/ofuser/blueCFD/OpenFOAM-4.x/platforms/mingw_w64GccDPInt32Opt/src/lagrangian/intermediate/makeBasicKinematicCollidingParcelSubmodels.o] Error 1

星星星星晴

@upc_ngh

好吧，我也没自己完全弄过这个东西，不过告诉你个好消息。
再PairSpringSliderDashpot.C上 #include random.H
然后在最下面的class:evaluatePair 尝试通过，你可以试试。

Random rndGen(0);
scalar samples = rndGen.scalar01();

你可以看看这个例子怎么调用的random
/opt/openfoam/OpenFOAM-4.1/applications/test/BinSum

upc_ngh

好的，我认真看看，非常感谢您的回答，谢谢