Author
anonymous
about 7 years ago
Language
Compiler
Options
Author
anonymous
about 7 years ago
$ prog.cc: In lambda function:
prog.cc:13:33: error: inconsistent types 'std::nullopt_t' and 'std::optional<int>' deduced for lambda return type
return std::optional{f()};
^
prog.cc:13:33: error: no matching function for call to 'std::nullopt_t::nullopt_t(std::optional<int>)'
In file included from prog.cc:1:
/opt/wandbox/gcc-head/include/c++/9.0.0/optional:70:24: note: candidate: 'constexpr std::nullopt_t::nullopt_t(std::nullopt_t::_Construct)'
explicit constexpr nullopt_t(_Construct) { }
^~~~~~~~~
/opt/wandbox/gcc-head/include/c++/9.0.0/optional:70:24: note: no known conversion for argument 1 from 'std::optional<int>' to 'std::nullopt_t::_Construct'
/opt/wandbox/gcc-head/include/c++/9.0.0/optional:60:10: note: candidate: 'constexpr std::nullopt_t::nullopt_t(const std::nullopt_t&)'
struct nullopt_t
^~~~~~~~~
/opt/wandbox/gcc-head/include/c++/9.0.0/optional:60:10: note: no known conversion for argument 1 from 'std::optional<int>' to 'const std::nullopt_t&'
/opt/wandbox/gcc-head/include/c++/9.0.0/optional:60:10: note: candidate: 'constexpr std::nullopt_t::nullopt_t(std::nullopt_t&&)'
/opt/wandbox/gcc-head/include/c++/9.0.0/optional:60:10: note: no known conversion for argument 1 from 'std::optional<int>' to 'std::nullopt_t&&'
Exit Code:
1