Validate float number in C++ (nan, inf) ?

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Lets say we have a class to represent a river:

In

class River

{

public:

** void SetUpstreamFlow(const float upstreamFlow);

 

private:

** float m_upstreamFlow;

}

 

Do you think that it would be "over kill" to have a precondition like this:

 

void River::SetUpstreamFlow(const float upstreamFlow)

{

*** // preconditions

*** if (isnan(upstreamFlow) || isinf(upstreamFlow) || upstreamFlow < 0.0f)

*** {

*** ** throw std::invalid_argument("River::SetUpstreamFlow()");

*** }

 

*** m_upstreamFlow = upstreamFlow;

}

 

In our application we've got -1.#IND sometimes on resulting files. I thinks that we could catch those errors early with some precondition like this.What would you do ?

 

Thanks

 

 

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