implicit constructor not working
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 45/100
Research direction
Start with the Godbolt reproduction linked in the issue and compare the failing f3 and f4 calls with the working f1 and f2 calls. Read boost/optional.hpp and boost/utility/string_view.hpp to trace the implicit-conversion constructors; done means the f3 and f4 calls compile consistently with the standard optional cases.
Written by the indexing model from the issue text.
Description
calls to f3 and f4 do not compile:
https://godbolt.org/z/K4c1edTK3
#include <optional>
#include <string_view>
#include <boost/optional.hpp>
#include <boost/utility/string_view.hpp>
void f1( std::optional< std::string_view > ) {}
void f2( std::optional< boost::string_view > ) {}
void f3( boost::optional< std::string_view > ) {}
void f4( boost::optional< boost::string_view > ) {}
int main()
{
f1("hello");
f2("hello");
f3("hello");
f4("hello");
}
- Dominant language
- C++
- Stars
- 60
- Forks
- 75
- PR merge metrics
- No merged PRs in 30d
Contributor guide
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- Read the whole issue, then the project's contributing guide.
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- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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