CODEWITHSUNDEEP
c++classconstructoreigen
tryingtosolve
tryingtosolve

Reputation: 803

C++: passing a function to a constructor when using Eigen

I'm using Eigen in a class that I'm working on. Here's the code excerpt:

class model {

public:
    Eigen::MatrixXd Ac;

    model (vars &, std::function<Eigen::MatrixXd()>, std::function<Eigen::MatrixXd()>);
};

model::model (vars & vars, std::function<Eigen::MatrixXd()> muX, 
std::function<Eigen::MatrixXd()> muX2)

    //update Ac
    Ac = muX(vars) + muX2(vars);


};

The idea is that when creating an object of model, the user will have to supply the functions muX and muX2, and the class will fill in values in MatrixXd Ac using muX and muX2. vars is just a class consisting of multiple variables that I created, and muX and muX2 are expected to use the data in vars as input.

However, in my XCode, it's giving me an error saying: "No matching function for call to object of type `std::function". I haven't compiled yet but I think the compiler will give me the same error.

Upvotes: 0

Views: 42

Answers (1)

Valentin
Valentin

Reputation: 1158

std::function<Eigen::MatrixXd()> implies that it takes a function which accepts no arguments and returns an Eigen::MatrixXd, which I think is not what you want to do. You probably want to change it to std::function<Eigen::MatrixXd(vars&)>

Upvotes: 1

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