在我的程序中，我需要使用Eigen库进行一些转换。当我使用配置文件供用户调整某些设置时，我正在寻找一种将转换集成到此配置文件中的方法。我想出了以下代码：
#include <boost\program_options.hpp>
#include <boost\log\trivial.hpp>
#include <Eigen\Geometry>
namespace po = boost::program_options;
int main(int ac, char* av[])
{
std::vector<std::array<double, 16>> trans;
try {
po::options_description desc("Options");
desc.add_options()
("help,h", "Produce help message")
("config,c", po::value<std::string>(&configPath), "Path of the config file.")
("trans", po::value<std::vector<std::array<double, 16>>>(&trans)->multitoken(), "Vector of 4D Transformation Matrix. Syntax: {x_11, ..., x_14, x_21, ..., x_24, ..., x_44}")
;
po::variables_map vm;
po::store(po::parse_command_line(ac, av, desc), vm);
po::notify(vm);
if (vm.count("help")) {
BOOST_LOG_TRIVIAL(info) << desc;
return EXIT_SUCCESS;
}
std::ifstream configFile(configPath);
po::store(po::parse_config_file(configFile, desc), vm);
po::notify(vm);
}
catch (std::exception& e) {
BOOST_LOG_TRIVIAL(error) << "error: " << e.what();
return EXIT_FAILURE;
}
catch (...) {
BOOST_LOG_TRIVIAL(error) << "Exception of unknown type!";
return EXIT_FAILURE;
}
Eigen::Affine3d transAff(Eigen::Matrix4d(trans.data()).transpose());
// Do some stuff
}
但是不幸的是，在构建解决方案时，我运行时出错。错误发生在转换的add_options行，并显示：
myDirectory\vcpkg\installed\x64-windows\include\boost\lexical_cast\detail\converter_lexical.hpp(243): error C2338: Target type is neither std::istream`able nor std::wistream`able
myDirectory\vcpkg\installed\x64-windows\include\boost\lexical_cast\detail\converter_lexical.hpp(270): note: see reference to class template instantiation 'boost::detail::deduce_target_char_impl<boost::detail::deduce_character_type_later<std::array<double,16>>>' being compiled
myDirectory\vcpkg\installed\x64-windows\include\boost\lexical_cast\detail\converter_lexical.hpp(407): note: see reference to class template instantiation 'boost::detail::deduce_target_char<Target>' being compiled
with
[
Target=std::array<double,16>
]
myDirectory\vcpkg\installed\x64-windows\include\boost\lexical_cast\detail\converter_lexical.hpp(464): note: see reference to class template instantiation 'boost::detail::lexical_cast_stream_traits<Source,Target>' being compiled
with
[
Source=src,
Target=std::array<double,16>
]
myDirectory\vcpkg\installed\x64-windows\include\boost\lexical_cast\try_lexical_convert.hpp(196): note: see reference to class template instantiation 'boost::detail::lexical_converter_impl<Target,src>' being compiled
with
[
Target=std::array<double,16>
]
myDirectory\vcpkg\installed\x64-windows\include\boost\lexical_cast.hpp(41): note: see reference to function template instantiation 'bool boost::conversion::detail::try_lexical_convert<Target,Source>(const Source &,Target &)' being compiled
with
[
Target=std::array<double,16>,
Source=std::basic_string<char,std::char_traits<char>,std::allocator<char>>
]
myDirectory\vcpkg\installed\x64-windows\include\boost\program_options\detail\value_semantic.hpp(92): note: see reference to function template instantiation 'Target boost::lexical_cast<T,std::basic_string<char,std::char_traits<char>,std::allocator<char>>>(const Source &)' being compiled
with
[
Target=std::array<double,16>,
T=std::array<double,16>,
Source=std::basic_string<char,std::char_traits<char>,std::allocator<char>>
]
myDirectory\vcpkg\installed\x64-windows\include\boost\program_options\detail\value_semantic.hpp(149): note: see reference to function template instantiation 'void boost::program_options::validate<T,char>(boost::any &,const std::vector<std::string,std::allocator<_Ty>> &,T *,long)' being compiled
with
[
T=std::array<double,16>,
_Ty=std::string
]
myDirectory\vcpkg\installed\x64-windows\include\boost\program_options\detail\value_semantic.hpp(184): note: see reference to function template instantiation 'void boost::program_options::validate<std::array<double,16>,char>(boost::any &,const std::vector<std::string,std::allocator<_Ty>> &,std::vector<std::array<double,16>,std::allocator<std::array<double,16>>> *,int)' being compiled
with
[
_Ty=std::string
]
myDirectory\vcpkg\installed\x64-windows\include\boost\program_options\detail\value_semantic.hpp(177): note: while compiling class template member function 'void boost::program_options::typed_value<std::vector<std::array<double,16>,std::allocator<_Ty>>,char>::xparse(boost::any &,const std::vector<std::string,std::allocator<std::basic_string<char,std::char_traits<char>,std::allocator<char>>>> &) const'
with
[
_Ty=std::array<double,16>
]
myDirectory\myProgram\src\myProgram.cpp(91): note: see reference to class template instantiation 'boost::program_options::typed_value<std::vector<std::array<double,16>,std::allocator<_Ty>>,char>' being compiled
with
[
_Ty=std::array<double,16>
]
我认为该错误是由于以下事实造成的：我尝试执行的方式不支持数组的向量。有什么方法可以做到这一点，或者有一种更聪明的方式来处理这些转换？
非常感谢！
答案 0 :(得分：0)
我通过修改自己设法解决了这个问题。如果其他人有同样的问题，我希望我可以帮助他解决这个问题。
第一步，由于功能更多，并且不鼓励在许多帖子中使用数组，例如here，所以我将所有数组都更改为std::vector。
std::string作为内部std::vector的临时替代物由于vector中的vector对于程序选项来说是一项艰巨的任务（因为multitoken只会将元素添加到vector中，并且在矢量层之间不能有所不同），因此我将内部std::vector替换为字符串，因此add_options现在是
std::vector<std::string> trans;
try {
po::options_description desc("Options");
desc.add_options()
("help,h", "Produce help message")
("config,c", po::value<std::string>(&configPath), "Path of the config file.")
("trans", po::value<std::vector<std::string>>(&trans)->multitoken(), "Vector of 4D Transformation Matrix. Syntax: x_11 ... x_14 x_21 ... x_24 ... x_44")
;
...
std::string到std::vector<double>的转化现在，我们可以将字符串从输入转换为双精度的向量，因为它们可用于创建Eigen::Matrix和Eigen::Vector。我在this post中从NathanOliver那里得到了这个主意，直到我这样使用：
std::vector<double> str2vec(std::string str) {
std::vector<double> out;
std::stringstream ss(str);
double tmpVal;
while (ss >> tmpVal)
out.push_back(tmpVal);
return out;
}
最后，我的代码如下：
#include <boost\program_options.hpp>
#include <boost\log\trivial.hpp>
#include <Eigen\Geometry>
namespace po = boost::program_options;
std::vector<double> str2vec(std::string str) {
std::vector<double> out;
std::stringstream ss(str);
double tmpVal;
while (ss >> tmpVal)
out.push_back(tmpVal);
return out;
}
int main(int ac, char* av[])
{
std::vector<std::string> transVecStr;
try {
po::options_description desc("Options");
desc.add_options()
("help,h", "Produce help message")
("config,c", po::value<std::string>(&configPath), "Path of the config file.")
("transVecStr", po::value<std::vector<std::string>>(&transVecStr)->multitoken(), "Vector of 4D Transformation Matrix. Syntax: x_11 ... x_14 x_21 ... x_24 ... x_44")
;
po::variables_map vm;
po::store(po::parse_command_line(ac, av, desc), vm);
po::notify(vm);
if (vm.count("help")) {
BOOST_LOG_TRIVIAL(info) << desc;
return EXIT_SUCCESS;
}
std::ifstream configFile(configPath);
po::store(po::parse_config_file(configFile, desc), vm);
po::notify(vm);
}
catch (std::exception& e) {
BOOST_LOG_TRIVIAL(error) << "error: " << e.what();
return EXIT_FAILURE;
}
catch (...) {
BOOST_LOG_TRIVIAL(error) << "Exception of unknown type!";
return EXIT_FAILURE;
}
std::vector<Eigen::Affine3d> affineVec;
for(int i = 0; i<transVecStr.size();i++){
affineVec.emplace_back(Eigen::Matrix4d(str2vec(transVecStr[i]).data()).transpose());
}
// Do some stuff
}