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cannot iterate over const chain object. #65
Description
The following fails, can't construct the iterator
#include <vector>
#include "cppitertools/chain.hpp"
int main() {
std::vector<char> v1 = {'a'};
std::vector<char> v2 = {'b'};
const auto ch = iter::chain(v1, v2);
std::begin(ch);
}Because the chain begin() const is saying that the iterator needs a const tuple<Ts...> while what it actually gets is tuple<const Ts...>
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