What does this mean?

[Jesukiran]

inline double FittingMod::model(const std::vector<double>& t, const std::vector<double>& p)

could someone explain this, piece by piece? why is there space between & and t? Is it a reference pointer?

[tath]

inline keyword is telling compiler to not call function but simply copy its body into the code everytime it is exectued.
double is the type of returning value
FittingMod:: is the class name to which this method belong
const std::vector<double>& t is constant (read only) reference to std::vector holding double types.
const std::vector<double>& p is same as previous.

when you place & or * there is no need for space.

int *p is the same as int*p or int * p, although i prefer to use int* p since pointer is type of variable.

[Jesukiran]

thank you very much!