032-coroutine.cpp

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#include "032-coroutine.hpp"
 
// this is our first corountine
template<typename SemanticReturnType>
ResumableType<SemanticReturnType>
sum(SemanticReturnType a, SemanticReturnType b)
{
    // co_return expression
    // terminates the coroutine
    
    co_yield a * b;
 
    co_yield a + b;
 
    co_return (a + b)*( a - b);
}
 
void test_coroutine_basic()
{
    // at this point, our corountine co_sum
    // is initially suspended
    ResumableType<int> co_sum = sum(2, 3);
 
    co_sum.resume();
 
    std::cout <<"sum(2,3) = " 
        << co_sum.get() << std::endl;
 
    co_sum.resume();
 
    std::cout <<"sum(2,3) = " 
        << co_sum.get() << std::endl;
 
    co_sum.resume();
 
    std::cout <<"sum(2,3) = " 
        << co_sum.get() << std::endl;
 
}
 
template<typename SemanticReturnType>
ResumableType<SemanticReturnType>
summation(SemanticReturnType max)
{
    SemanticReturnType s = 0;
 
    for(SemanticReturnType i = 0;
        i < max; ++i)
    {
        s += i;
        co_yield s;   
    }
 
    co_return s;
}
 
void advanced_coroutine()
{
    auto cosum = summation(11);
 
    for(int i=0; i < 11; ++i)
    {
        std::cout << cosum.next() << std::endl;
    }
}
 
int main()
{
    // test_coroutine_basic();
    advanced_coroutine();
}