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Telegram/ThirdParty/range-v3/example/accumulate_ints.cpp

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+// Range v3 library
+//
+//  Copyright Eric Niebler 2019
+//
+//  Use, modification and distribution is subject to the
+//  Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+//
+// Project home: https://github.com/ericniebler/range-v3
+//
+
+///[accumulate_ints]
+// Sums the first ten squares and prints them, using views::ints to generate
+// and infinite range of integers, views::transform to square them, views::take
+// to drop all but the first 10, and accumulate to sum them.
+
+#include <iostream>
+#include <vector>
+
+#include <range/v3/numeric/accumulate.hpp>
+#include <range/v3/view/iota.hpp>
+#include <range/v3/view/take.hpp>
+#include <range/v3/view/transform.hpp>
+using std::cout;
+
+int main()
+{
+    using namespace ranges;
+    int sum = accumulate(views::ints(1, unreachable) | views::transform([](int i) {
+                             return i * i;
+                         }) | views::take(10),
+                         0);
+    // prints: 385
+    cout << sum << '\n';
+}
+///[accumulate_ints]