使用boost::math::policies的测试程序

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本文介绍了如何使用Boost库中的boost::math::policies组件来定义和控制数学计算中的策略,包括舍入方式、溢出处理和特殊值处理。通过一个示例程序展示了如何处理圆周率倒数计算中的特殊值和溢出情况,从而实现数学计算的灵活控制和定制。

使用boost::math::policies的测试程序

Boost是一个功能强大的C++库,提供了许多用于数学计算和数值处理的工具。其中boost::math::policies是一个重要的组件,它允许我们在数学计算中定义和控制各种策略,如舍入方式、溢出处理、特殊值处理等。本文将展示一个使用boost::math::policies的测试程序,并对其进行详细解释。

在开始之前,我们需要确保已经安装了Boost库,并将其包含在项目中。在编写使用boost::math::policies的程序之前,我们先来了解一下它的一些常用策略。

  1. 舍入方式(Rounding Policies):定义了如何处理浮点数的舍入操作,包括向上取整、向下取整、四舍五入等。
  2. 溢出处理(Overflow Policies):定义了在计算中发生溢出时的处理方式,如抛出异常、返回特定的结果等。
  3. 特殊值处理(Special Values Policies):定义了如何处理特殊的浮点数值,如NaN(Not-a-Number)、无穷大等。

现在,让我们用一个示例程序来演示boost::math::policies的用法。假设我们想计算圆周率的倒数,但要在计算过程中处理特殊值和溢出情况。

#include 
一直出现这种报错是为什么/usr/include/boost/mpl/aux_/preprocessed/gcc/plus.hpp:68:8: note:boost::mpl::plus’ 68 | struct plus | ^~~~ In file included from /usr/include/pcl-1.10/pcl/point_types.h:44, from /usr/include/pcl-1.10/pcl/common/impl/copy_point.hpp:41, from /usr/include/pcl-1.10/pcl/common/copy_point.h:58, from /usr/include/pcl-1.10/pcl/common/impl/io.hpp:45, from /usr/include/pcl-1.10/pcl/common/io.h:586, from /usr/include/pcl-1.10/pcl/io/file_io.h:41, from /usr/include/pcl-1.10/pcl/io/pcd_io.h:44, from /opt/ros/noetic/include/pcl_conversions/pcl_conversions.h:70, from /home/nonobody/catkin_ws/src/grid_path_searcher/src/demo_node.cpp:4: /usr/include/pcl-1.10/pcl/point_types.h:535:1: error: ‘plus’ is not a member of ‘pcl::traits’ 535 | POINT_CLOUD_REGISTER_POINT_STRUCT (pcl::MomentInvariants, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /usr/include/pcl-1.10/pcl/point_types.h:535:1: note: suggested alternatives: In file included from /usr/include/c++/9/string:48, from /usr/include/c++/9/bits/locale_classes.h:40, from /usr/include/c++/9/bits/ios_base.h:41, from /usr/include/c++/9/ios:42, from /usr/include/c++/9/ostream:38, from /usr/include/c++/9/iostream:39, from /home/nonobody/catkin_ws/src/grid_path_searcher/src/demo_node.cpp:1: /usr/include/c++/9/bits/stl_function.h:167:12: note: ‘std::plus’ 167 | struct plus : public binary_function<_Tp, _Tp, _Tp> | ^~~~ In file included from /usr/include/boost/mpl/aux_/include_preprocessed.hpp:37, from /usr/include/boost/mpl/aux_/arithmetic_op.hpp:34, from /usr/include/boost/mpl/plus.hpp:19, from /usr/include/boost/mpl/vector/aux_/iterator.hpp:19, from /usr/include/boost/mpl/vector/aux_/vector0.hpp:22, from /usr/include/boost/mpl/vector/aux_/clear.hpp:18, from /usr/include/boost/mpl/vector/vector0.hpp:24, from /usr/include/boost/mpl/vector/vector10.hpp:18, from /usr/include/boost/mpl/vector/vector20.hpp:18, from /usr/include/boost/mpl/vector.hpp:36, from /usr/include/boost/math/policies/policy.hpp:14, from /usr/include/boost/math/policies/error_handling.hpp:21, from /usr/include/boost/math/special_functions/round.hpp:14, from /opt/ros/noetic/include/ros/time.h:58, from /opt/ros/noetic/include/ros/ros.h:38, from /opt/ros/noetic/include/pcl_conversions/pcl_conversions.h:42, from /home/nonobody/catkin_ws/src/grid_path_searcher/src/demo_node.cpp:4:
08-26
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