std::transform 应用给定的函数到某个/些输入范围中的元素,并将结果存储到从 d_first 开始的输出范围。 1) 应用一元函数 unary_op 到[first1, last1) 中的元素。如果unary_op 使以下某个范围中的某个迭代器失效,或者修改了以下某个范围中的某个元素,那么行为未定义: [first1, last1]。 包含std::...
std::transformdoes not guarantee in-order application ofunary_oporbinary_op. To apply a function to a sequence in-order or to apply a function that modifies the elements of a sequence, usestd::for_each. Example Run this code Output: ...
1)等价于transform_reduce(first1, last1, first2, init, std::plus<>(),std::multiplies<>()),实际上是默认的std::inner_product的等效并行版本。 3)应用transform到来自范围[first1,last1)和从first2开始的包含std::distance(first1, last1)个元素的范围的每对元素,并在reduce上与初始值init一同规约各...
end(), std::ostream_iterator<int>(std::cout, " "), 0, std::plus<int>{}, times_10); std::cout << "\n10 times inclusive sum: "; std::transform_inclusive_scan(data.begin(), data.end(), std::ostream_iterator<int>(std::cout, " "), std::plus<int>{}, times_10); std::...
常用的一些并行算法包括std::for_each、std::transform、std::reduce等,它们都有对应的并行版本std::for_each_par、std::transform_par、std::reduce_par等。 使用并行算法时,需要注意数据之间是否存在数据竞争或其他线程安全问题。确保共享数据被正确地保护起来,以避免潜在的错误。 需要注意的是,并行算法库只能在...
auto clone = [](std::unique_ptr<Base> const& pointer){ return pointer->cloneBase(); }; std::transform(begin(source), end(source), std::inserter(destination, end(destination)), clone); 或者: for (auto const& pointer : source) { destination.insert(pointer->cloneBase()); } ...
std::vector<Product> items{{"hello",0}, {"world",1}, {"json",2}, {"master",3}};for(auto *item : items |std::views::transform(tr_items_ptr_fn)|std::views::filter(ft_items_size_fn(1))){ auto&[_n, _s] = *item; ...
std::transform_reduce(std::cbegin(a), std::cend(a), 0, std::plus<>{}, times_ten); // == 60 const std::array<int, 3> b{ 1, 2, 3 }; const auto product_times_ten = [](const auto a, const auto b) { return a * b * 10; }; std::transform_reduce(std::cbegin(a),...
Using std::cpp 2025 keynote: The Real Problem of C++ New C++ features in GCC 15 OpenVDB OpenVDB - Sparse volume data structure and tools Featured Library// CategoryGraphics 2025 Annual C++ Developer Survey "Lite" ArticlePopular Story// standardcpp.typeform.com ...
( srgb ),1.f/gamma);//linearize and apply gamma correctionreturnrgb32::fromRgb(srgb::fromLrgb( corrRgb ) );//convert back to srgb};std::transform( std::execution::par_unseq, dataPtr, dataPtr + image.width() * image.height(), dataPtr, pixelOperation ); image.save("image_high-...