c++17 structured biding example

Author: hbobenicio

structured-biding/main.cpp

@@ -0,0 +1,34 @@
+/**
+ * C++17 Structured Biding Example.
+ *
+ * Compile with something like this:
+ *
+ * $ clang++-7 -std=c++17 -Wall -pedantic -Werror main.cpp
+ */
+#include <iostream>
+#include <tuple>
+#include <cmath>
+#include <limits>
+
+static constexpr float EPSILON = 0.00001f;
+static constexpr float MONEY_EPSILON = 0.01f;
+
+using DivideResult = std::tuple<float, const char*>;
+
+static DivideResult divide(float x, float y, float eps = EPSILON) {
+	if (fabs(y) < eps) {
+		return DivideResult{0.0f, "cannot divide by zero!"};
+	}
+	return DivideResult{x / y, nullptr};
+}
+
+int main() {
+	const auto [x, err] = divide(1.0f, 0.009f, MONEY_EPSILON);
+	if (err) {
+		std::cerr << "division error: " << err << '\n';
+		exit(EXIT_FAILURE);
+	}
+
+	std::cout << x << '\n';
+}
+