fix #1446

[uuiid]

fix #1446

[fnc12]

hi @uuiid . Thanks for this PR. Please fix failing CI https://ci.appveyor.com/project/fnc12/sqlite-orm/builds/52612615 and please replace non-English commit messages to English cause this project is being ran in English as open source project.

[uuiid]

你好@uuiid感谢你的 PR。请修复失败的 CI https://ci.appveyor.com/project/fnc12/sqlite-orm/builds/52612615，并将非英语提交信息替换为英语，因为该项目是作为开源项目以英语运行的。

ok

[trueqbit]

Thank you @uuiid for your valuable contribution!

Since it's not a problem of the result_set_iterator it's better to solve it at the level of the column_result_proxy facility.

template<class Tpl>
struct column_result_proxy<Tpl, match_specialization_of<Tpl, std::tuple>>
    : tuple_transformer<Tpl, column_result_proxy_t> {};

Additionally there are already static unit tests for result set iteration in tests/static_tests/iterator_t.cpp, which can be amended.

For reference see a comparison of a commit in branch that I created.

But I think it would be fair to credit you with the contribution.

[uuiid]

Great, much better than my solution, please merge the https://github.com/fnc12/sqlite_orm/tree/fix_multi_colresult branch directly, and close this pull request directly

[trueqbit]

Closed in favor of #1448