c-Ubuntu上的Boost program_options代码中的链接错误
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我在Ubuntu 10.04上安装了Boost
sudo apt-get install libboost-dev
我认为在那之后我不需要设置任何-I和-L标志,因此我可以通过以下方式编译代码
g++ test.cpp
这是我的test.cpp
#include <iostream>
#include <string>
#include <set>
#include <sstream>
#include <boost/config.hpp>
#include <boost/program_options/detail/config_file.hpp>
#include <boost/program_options/parsers.hpp>
namespace pod = boost::program_options::detail;
int main()
{
//contents
std::stringstream s(
"a = 1\n"
"b = 2\n"
"c = test option\n");
//parameters
std::set<std::string> options;
options.insert("a");
options.insert("b");
options.insert("c");
//parser
for (pod::config_file_iterator i(s, options), e ; i != e; ++i)
{
std::cout << i->value[0] << std::endl;
}
}
我认为一切都会顺利进行,但实际上存在一些错误:
/tmp/ccNQEbJM.o: In function `boost::program_options::detail::basic_config_file_iterator<char>::basic_config_file_iterator(std::basic_istream<char, std::char_traits<char> >&, std::set<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&, bool)':
a.cpp:(.text._ZN5boost15program_options6detail26basic_config_file_iteratorIcEC1ERSiRKSt3setISsSt4lessISsESaISsEEb[boost::program_options::detail::basic_config_file_iterator<char>::basic_config_file_iterator(std::basic_istream<char, std::char_traits<char> >&, std::set<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&, bool)]+0x24): undefined reference to `boost::program_options::detail::common_config_file_iterator::common_config_file_iterator(std::set<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&, bool)'
a.cpp:(.text._ZN5boost15program_options6detail26basic_config_file_iteratorIcEC1ERSiRKSt3setISsSt4lessISsESaISsEEb[boost::program_options::detail::basic_config_file_iterator<char>::basic_config_file_iterator(std::basic_istream<char, std::char_traits<char> >&, std::set<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&, bool)]+0x5f): undefined reference to `boost::program_options::detail::common_config_file_iterator::get()'
/tmp/ccNQEbJM.o: In function `boost::eof_iterator<boost::program_options::detail::common_config_file_iterator, boost::program_options::basic_option<char> >::increment()':
a.cpp:(.text._ZN5boost12eof_iteratorINS_15program_options6detail27common_config_file_iteratorENS1_12basic_optionIcEEE9incrementEv[boost::eof_iterator<boost::program_options::detail::common_config_file_iterator, boost::program_options::basic_option<char> >::increment()]+0x10): undefined reference to `boost::program_options::detail::common_config_file_iterator::get()'
/tmp/ccNQEbJM.o: In function `boost::program_options::detail::basic_config_file_iterator<char>::getline(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)':
a.cpp:(.text._ZN5boost15program_options6detail26basic_config_file_iteratorIcE7getlineERSs[boost::program_options::detail::basic_config_file_iterator<char>::getline(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)]+0x5b): undefined reference to `boost::program_options::to_internal(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
collect2: ld returned 1 exit status
我不知道我在哪里以及为什么出错.
解决方法:
您需要链接到Boost program_options库,因为并不是Boost中的所有内容都是纯模板:
edd@max:/tmp$cat bpoex.cpp
#include <iostream>
#include <string>
#include <set>
#include <sstream>
#include <boost/config.hpp>
#include <boost/program_options/detail/config_file.hpp>
#include <boost/program_options/parsers.hpp>
namespace pod = boost::program_options::detail;
int main()
{
//contents
std::stringstream s(
"a = 1\n"
"b = 2\n"
"c = test option\n");
//parameters
std::set<std::string> options;
options.insert("a");
options.insert("b");
options.insert("c");
//parser
for (pod::config_file_iterator i(s, options), e ; i != e; ++i)
{
std::cout << i->value[0] << std::endl;
}
}
edd@max:/tmp$g++ -o bpoex bpoex.cpp -lboost_program_options
edd@max:/tmp$./bpoex
1
2
test option
edd@max:/tmp$
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