c++ - How to use const qualifier with decltype? -

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how use const qualifier decltype template-ed function ?

current gcc rejects following : 

template <typename it> bool process(it first , last ) {    return  std::all_of( first, last,                         [](  const decltype(*first)& )                        //   ^^^^^ without const works fine                        {                              return % 2 == 0;                         }                       ) ; }

is legal/possible use i const reference inside lambda ?

const decltype(*first)& doesn't work because decltype(*first) int&, expect int. can use std::remove_reference work around (although doesn't make code clearer): const std::remove_reference<decltype(*first)>::type&


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