luau/tests/IostreamOptional.h
Arseny Kapoulkine 3f1508c83a
Sync to upstream/release/505 (#216)
- Improve error recovery during type checking
- Initial (not fully complete) implementation for singleton types (RFC RFC: Singleton types #37)
- Implement a C-friendly interface for compiler (luacode.h)
- Remove C++ features from lua.h (removed default arguments from luau_load and lua_pushcfunction)
- Fix lua_breakpoint behavior when enabled=false
- Implement coroutine.close (RFC RFC: coroutine.close #88)

Note, this introduces small breaking changes in lua.h:

- luau_load env argument is now required, pass an extra 0
- lua_pushcfunction now must be called with 3 arguments; if you were calling it with 2 arguments, pass an extra NULL; if you were calling it with 4, use lua_pushcclosure.

These changes are necessary to make sure lua.h can be used from pure C - the future release will make it possible by adding an option to luaconf.h to change function name mangling to be C-compatible. We don't anticipate breaking the FFI interface in the future, but this change was necessary to restore C compatibility.

Closes #121
Fixes #213
2021-11-19 08:10:07 -08:00

24 lines
552 B
C++

// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
#pragma once
#include <ostream>
#include <optional>
namespace std
{
inline std::ostream& operator<<(std::ostream& lhs, const std::nullopt_t&)
{
return lhs << "none";
}
template<typename T>
auto operator<<(std::ostream& lhs, const std::optional<T>& t) -> decltype(lhs << *t) // SFINAE to only instantiate << for supported types
{
if (t)
return lhs << *t;
else
return lhs << "none";
}
} // namespace std