基于循环变换的范围

Question

我有以下代码：

for (int idx : partOrderOptimizer.polyOrder)
{
    SliceLayerPart* part = &layer->parts[idx];
    ...
}

我如何将其转换为基于循环的单一范围，类似：

for (SliceLayerPart* part = &layer->parts[idx] where int idx : partOrderOptimizer.polyOrder)
{
    ...
}

Answer 1

只需使用boost::transformed：

for (SliceLayerPart* part : partOrderOptimizer.polyOrder | boost::transformed([&](int idx) { return &layer->parts[idx]; }))
{
    ...
}