FP "unassignedVariable" with C++ 17s structured binding

[Dan Workman]

Found in version 2.5

When using C++17s structured binding in range based for loops cppcheck is claiming that the first variable is never assigned:

struct Pair
{
  Pair(int first, int second) : first(first), second(second) {};
  int first;
  int second;
};

std::vector<Pair> GetPairs()
{
  return {{0, 1}, {1, 2}};
}

int main()
{
  for (const auto& [first, second] : GetPairs())
  {
    std::cout << first << second;
  }
}

generates:

cppcheckWarnings.cpp:35:21: warning: Variable 'first' is not assigned a value. [unassignedVariable]
  for (const auto& [first, second] : GetPairs())
                    ^

Dropping the reference fixes the issue but in our actual use case we are passing out custom iterators

[CHR]

Sounds similar to this ticket: https://trac.cppcheck.net/ticket/10368