函數(shù) -> lazy_sum
函數(shù)調(diào)用 -> lazy_sum()
函數(shù)調(diào)用的結(jié)果 -> f = lazy_sum()
結(jié)果是一個函數(shù) -> f
繼續(xù)調(diào)用函數(shù) -> f()
函數(shù) -> lazy_sum
函數(shù)調(diào)用 -> lazy_sum()
函數(shù)調(diào)用的結(jié)果 -> f = lazy_sum()
結(jié)果是一個函數(shù) -> f
繼續(xù)調(diào)用函數(shù) -> f()