generator.cpp

Example of using a generator to generate Fibonacci numbers.

#include <iostream>
 
#include "generator.h"
 
namespace {

wwa::coro::generator<int> fibonacci(int n)
{
    int a = 0;
    int b = 1;
 
    if (n > 0) {
        co_yield a;
    }
 
    if (n > 1) {
        co_yield b;
    }
 
    for (int i = 2; i < n; ++i) {
        auto s = a + b;
        co_yield s;
        a = b;
        b = s;
    }
}
 
}  // namespace
 
int main()
{
    std::cout << "The first 10 Fibonacci numbers are: ";
    for (auto n : fibonacci(10)) {
        std::cout << n << ' ';
    }
 
    std::cout << '\n';
 
    // The expected output is:
    // The first 10 Fibonacci numbers are: 0 1 1 2 3 5 8 13 21 34
 
    return 0;
}