deque-blog/traversal_3_fold_algorithm_usage.cpp

## traversal_3_fold_algorithm_usage.cpp
auto read = read_stock_by_id("A");
auto res = fold(read(source),
                FindMinimum<double>(),
                GetAverage(),
                CountVariationBiggerThan(2));
	auto read = read_stock_by_id("A");
	auto res = fold(read(source),
	FindMinimum<double>(),
	GetAverage(),
	CountVariationBiggerThan(2));