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40 lines
920 B
C++
40 lines
920 B
C++
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// Range v3 library
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//
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// Copyright Jeff Garland 2017
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//
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// Use, modification and distribution is subject to the
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// Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// Project home: https://github.com/ericniebler/range-v3
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//
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///[count_if]
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// This example counts element of a range that match a supplied predicate.
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// output
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// vector: 2
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// array: 2
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#include <array>
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#include <iostream>
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#include <range/v3/algorithm/count_if.hpp> // specific includes
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#include <vector>
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using std::cout;
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auto is_six = [](int i) -> bool { return i == 6; };
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int
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main()
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{
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std::vector<int> v{6, 2, 3, 4, 5, 6};
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auto c = ranges::count_if(v, is_six);
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cout << "vector: " << c << '\n'; // 2
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std::array<int, 6> a{6, 2, 3, 4, 5, 6};
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c = ranges::count_if(a, is_six);
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cout << "array: " << c << '\n'; // 2
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}
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///[count_if]
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