if (promises.max_value() != NULL){ //at least of the promises has value
Stack GrowthThere’s another thing that can happen while a goroutine is running: it can run out of stack space. Go goroutines start with a tiny 2KB stack, and unlike OS threads, they don’t get a fixed-size stack upfront. Instead, the compiler inserts a small check called the stack growth prologue at the beginning of most functions. This check compares the current stack pointer against the stack limit — if there’s not enough room for the next function call, the runtime steps in.，更多细节参见WPS极速下载页
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smart display, where you automatically begin at the top of the。移动版官网对此有专业解读
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