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#include <functional>
#include <vector>
 
template <typename ...T, typename Result>
void componentWise(std::function<Result(T...)> f,
                   const std::vector<T> & ...v,
                   std::vector<Result> & result)
{
    // (I don't know how to express the assert)
    result.reserve(v.size()...);
 
    auto _v = v.begin()...;
    auto _result = result.begin();
    for(; _v != v.end()...; ++_v..., ++_result)
    {
        *_result = expression(*_v...);
    }
}

prog.cpp: In function ‘void componentWise(std::function<Result(T ...)>, const std::vector<T>& ..., std::vector<Result>&)’:
prog.cpp:12:23: error: parameter packs not expanded with ‘...’:
prog.cpp:12:23: note:         ‘v’
prog.cpp:12:24: error: expected ‘,’ or ‘;’ before ‘...’ token
prog.cpp:14:23: error: parameter packs not expanded with ‘...’:
prog.cpp:14:23: note:         ‘v’
prog.cpp:14:24: error: expected ‘;’ before ‘...’ token
prog.cpp:14:24: error: expected primary-expression before ‘...’ token
prog.cpp:14:24: error: expected ‘)’ before ‘...’ token
prog.cpp:14:24: error: expected primary-expression before ‘...’ token
prog.cpp:14:24: error: expected ‘;’ before ‘...’ token
prog.cpp:14:33: error: expected ‘;’ before ‘...’ token

Standard output is empty