c++ - C++11 中更优雅的 boost 积累？

Question

boost docs以此作为如何使用 boost::accumulate 的示例:

// The data for which we wish to calculate statistical properties:
std::vector< double > data( /* stuff */ );

// The accumulator set which will calculate the properties for us:
accumulator_set< double, features< tag::tail<left> > > acc(
    tag::tail<left>::cache_size = 4 );

// Use std::for_each to accumulate the statistical properties:
std::for_each( data.begin(), data.end(), bind<void>( ref(acc), _1 ) );

在 C++11/14 中，是否有更优雅的方法来使用基于范围的循环或 lambda 编写此代码？

Answer 1

我能想到的有两种方法，如下:

std::vector< double > data = {2.1, 2.2, 3.3, 4.4, 5.5};
accumulator_set< double, features< tag::tail<left> > > acc(tag::tail<left>::cache_size = 4);

for_each(data.begin(), data.end(), [&acc](double y){ acc(y); });

或

std::vector< double > data = {2.1, 2.2, 3.3, 4.4, 5.5};
accumulator_set< double, features< tag::tail<left> > > acc(tag::tail<left>::cache_size = 4);

for (auto y : data)
    acc(y);