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Make the result_t::iterator::operator++(int) return void in order to fix a bug and preserve compatibility with C++20 ranges.

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MeanSquaredError 2024-08-31 14:08:08 +03:00 committed by Roland Bock
parent 5564584799
commit 0a2765d588
1 changed files with 9 additions and 4 deletions
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13
include/sqlpp11/result.h
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@ -125,11 +125,16 @@ namespace sqlpp
return *this;
}
iterator operator++(int)
// It is quite difficult to implement a postfix increment operator that returns the old iterator
// because the underlying database results work in a stream fashion not allowing to return to
// previously-read rows.
//
// We need the postfix increment mostly for compatibility with C++20 ranges so we set the return
// type to "void" which is allowed for C++20 range iterators.
//
void operator++(int)
{
auto previous_it = *this;
_result.next(_result_row.get());
return previous_it;
++*this;
}
std::reference_wrapper<db_result_t> _result;