cpp unordered_set just use comparator not hash

#include <unordered_set> #include <iostream> class edge{ public: float a1; float a2; }; struct comp{ bool operator()(const edge& e1, const edge& e2) const { return true; return ( (e1.a1==e2.a1 && e1.a2==e2.a2) || (e1.a1==e2.a2 && e1.a2==e2.a1) ); }; }; struct hash{ size_t operator()(const edge& e1) const { // return std::hash<float>()(e1.a1+e1.a2); return std::hash<float>()(e1.a1+e1.a2*2); }; }; int main() {…

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How to exclude some files by name using glob.glob(“”)?

I’m using python glob.glob(“*.json”). The script returns a file of json files, but after applying some operations it creates a new json file. If I run the same script again it adds this new file in list… glob.glob(“*.json”) Output: [‘men_pro_desc_zalora.json’, ‘man_pro_desc_Zalando.json’, ‘man_pro_desc_nordstrom.json’] End of code: with open(“merged_file.json”, “w”) as outfile: json.dump(result, outfile) After running addition…

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How to let the Java compiler know that a generic parameter can become a child or parent

I want safe type conversion involving generic parameters, Like “Covariance and Contravariance in Generics” in .Net Here is a simplified example // P –> Param can become Parent (Contravariance) // R –> Result can become Child (Covariance) // F –> Field cannot be converted (Invariance) // Simplified Example public abstract class Foo<P, R, F> {…

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