34 lines
1.1 KiB
C++
34 lines
1.1 KiB
C++
// lambda1.cpp -- use captured variables
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#include <iostream>
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#include <vector>
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#include <algorithm>
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#include <cmath>
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#include <ctime>
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const long Size = 390000L;
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int main()
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{
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using std::cout;
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std::vector<int> numbers(Size);
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std::srand(std::time(0));
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std::generate(numbers.begin(), numbers.end(), std::rand);
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cout << "Sample size = " << Size << '\n';
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// using lambdas
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int count3 = std::count_if(numbers.begin(), numbers.end(),
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[](int x){return x % 3 == 0;});
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cout << "Count of numbers divisible by 3: " << count3 << '\n';
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int count13 = 0;
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std::for_each(numbers.begin(), numbers.end(),
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[&count13](int x){count13 += x % 13 == 0;});
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cout << "Count of numbers divisible by 13: " << count13 << '\n';
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// using a single lambda
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count3 = count13 = 0;
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std::for_each(numbers.begin(), numbers.end(),
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[&](int x){count3 += x % 3 == 0; count13 += x % 13 == 0;});
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cout << "Count of numbers divisible by 3: " << count3 << '\n';
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cout << "Count of numbers divisible by 13: " << count13 << '\n';
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// std::cin.get();
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return 0;
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} |