std::transform() 6.8.2 判断式(Predicate) Predict(判断式)是一种特殊的辅助函数。所谓predicate,它会返回布尔值(Boolean),常被用来指定作为排序准则或查找准则。Predict可能有一或两个操作数,视具体情况而定。 注意,并非任何返回布尔值的单参函数或双参函数都是合法的predicate.STL要求,面对相同的值,predicate必须...
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在R2中map()被重命名为transform(),因此实际新增的三个函数为transform(),and_then()和or_else()。 这些函数主要是避免手动检查optional值是否有效,比如: 一个使用的小例子: 错误的情况: 目前GCC 12,Clang 14,MSVC v19.32已经支持该特性。 3 std::expected(P0323) 该特性用于解决错误处理的问题,增加了一个...
(void)vfprintf(stderr, fmt, ap); va_end(ap); } Both the va_arg() and va_end() macros work the same for the old-style and ISO C versions. Because va_arg() changes the value of ap, the call to vfprintf() cannot be: (...
(void)fputs("warning: ", stderr); fmt = va_arg(ap, char *); (void)vfprintf(stderr, fmt, ap); va_end(ap); } Both the va_arg() and va_end() macros work the same for the old-style and ISO C versions. Because va_arg() changes the value of ap, the call to vfprintf...
views::reverse una::views::transform una::views::filter una::views::drop una::views::take//In C++20, you can just use std::ranges variants of these ranges,//but always use una::views::reverse from this library//because std::views::reverse is not good enought for Unicode.//You use...
P2442R1 Windowing Range Adaptors: views::chunk, views::slide VS 2022 17.3 23 P2443R1 views::chunk_by VS 2022 17.3 23 P2445R1 forward_like() VS 2022 17.4 23 P2446R2 views::as_rvalue VS 2022 17.4 23 P2465R3 Standard Library Modules std And ...
查找是谁调用transform::operator*(...)导致导常,查下有两处:PoseGraph2D::InitializeGlobalSubmapPoses、PoseGraph2D::ComputeConstraintsForNode,它们都可能抛出异常。 <cartographer>/mapping/internal/2d/pose_graph_2d.cc --- std::vector<SubmapId> PoseGraph2D::InitializeGlobalSubmapPoses( const int trajector...
该算法由nvc++ compiler和-stdpar option编译,在 GPU 上执行。根据编译器、编译器选项和并行算法的实现,还可以在多核 CPU 或其他类型的加速器上获得多线程执行。 此示例使用通用的for_each算法,该算法以函数对象的形式将任何元素操作应用于向量v。在本例中,它是一个内联 lambda 表达式。可以使用算法transform_redu...