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ПР14/3/main.cpp

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+#include "setgetter.h"
+#include <iostream>
+#include <set>
+
+int main()
+{
+	std::set<double> numeros;
+	std::cout << "got: " << setgetter::get(numeros) << std::endl;
+
+
+	numeros.insert(3);
+	std::cout << "added 3;" << std::endl;
+	std::cout << "got: " << setgetter::get(numeros) << std::endl;
+
+}

ПР14/3/setgetter.h

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+#pragma once
+#include <set>
+#include <iostream>
+#include <stdexcept>
+
+
+class setgetter
+{
+public:
+	template <class T>
+	static T get(std::set<T> set)
+	{
+		try {
+			if (set.begin() == set.end()) throw std::out_of_range("Out of range");
+			return *set.begin();
+		}
+		catch (std::out_of_range& e)
+		{
+			std::cout << e.what() << std::endl;
+			return T();
+		}
+	}
+};