init

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

@@ -0,0 +1,39 @@
+
+// Range v3 library
+//
+//  Copyright Jeff Garland 2017
+//
+//  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
+//
+
+///[count_if]
+// This example counts element of a range that match a supplied predicate.
+// output
+// vector:   2
+// array:    2
+
+#include <array>
+#include <iostream>
+#include <range/v3/algorithm/count_if.hpp> // specific includes
+#include <vector>
+using std::cout;
+
+auto is_six = [](int i) -> bool { return i == 6; };
+
+int
+main()
+{
+    std::vector<int> v{6, 2, 3, 4, 5, 6};
+    auto c = ranges::count_if(v, is_six);
+    cout << "vector:   " << c << '\n'; // 2
+
+    std::array<int, 6> a{6, 2, 3, 4, 5, 6};
+    c = ranges::count_if(a, is_six);
+    cout << "array:    " << c << '\n'; // 2
+}
+///[count_if]