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...
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...
(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...
#include <cstdlib> #include <iostream> #include <string> std::string say_hello() { return std::string("Hello, CMake superbuild world!"); } int main() { std::cout << say_hello() << std::endl; return EXIT_SUCCESS; } 项目结构如下,包含一个根目录CMakeLists.txt和一个src/CMakeLists...
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...
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...
(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: (...
// 已知概率的cells的盒子,方便做裁剪 Eigen::AlignedBox2i known_cells_box_; const std::vector<float>* value_to_correspondence_cost_table_; };一、MapLimits MapLimits用于描述概率图的范围。 struct CellLimits { // x轴上的栅格数量 int num_x_cells = 0; // y轴上的栅格数量 int num_y_cells...
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 ...
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 ...