虽然 pfc 的主业是把 ac 输入电流整理好，但由于 pfc 电路通常是基于 boost 结构的，它还能顺便把宽范围的输入电压提高到一个固定的值（通常是 400v 左右），这就刚好. 好事一件，足以让整个 c++ 圈沸腾了。 boost 1.89 成功实现了一项重大技术突破： 1372 项依赖被消除，142 个库得到了优化，这一改进可说大大地提升了编译效率、降低了部署复杂度，为.
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