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#include <boost/program_options.hpp>
 
namespace po = boost::program_options;
 
template <typename C, typename E>
inline bool contains(const C& container, const E& element) {
    return container.find(element) != container.end();
}
 
template <typename K, typename V>
V& updateFromConfig(V& updatee, const K& key, const po::variables_map& vm) {
    if (contains(vm, key)) {
        // option 1
        //updatee = vm[key];
        // option 2
        //updatee = vm[key].variable_value();
        // option 3
        updatee = vm[key].template as<V>();
        // option 4
        // updatee = vm[key].as();
    }
    return updatee;
}
 
template size_t& updateFromConfig<char*,size_t>(size_t& updatee, char* const& key, const po::variables_map& vm);
 
int main() {
    return 0;
}
 

/home/q07c0r/ccSHATwk.o: In function `unsigned int& updateFromConfig<char*, unsigned int>(unsigned int&, char* const&, boost::program_options::variables_map const&)':
prog.cpp:(.text._Z16updateFromConfigIPcjERT0_S2_RKT_RKN5boost15program_options13variables_mapE[_Z16updateFromConfigIPcjERT0_S2_RKT_RKN5boost15program_options13variables_mapE]+0x10f): undefined reference to `boost::program_options::abstract_variables_map::operator[](std::string const&) const'
collect2: error: ld returned 1 exit status

Standard output is empty