I have a function whose signature is:

void func(std::optional<std::string> os = std::nullopt);

(I’m aliasing std::experimental::optional until std::optional is officially available.)

However, I’m having difficulty calling it cleanly. The compiler will refuse to perform two implicit conversions (const char* ➝ std::string ➝ std::optional<std::string>) to call it with a raw C-string literal. I can do this:

func(std::string("Hello"));

And the compiler will figure that a std::optional is needed, and do the conversion. However, this is way too verbose. Thanks to C++11, I can also do this:

func({"Hello"});

While this is way better, it's still not ideal. I'd like to be able to call this function like any other that takes a std::string. Is this possible? Making the function take another parameter type is okay, as long as it behaves similarly to/is directly convertible to std::optional. Thanks.

I have a function whose signature is:

void func(std::optional<std::string> os = std::nullopt);

(I’m aliasing std::experimental::optional until std::optional is officially available.)

However, I’m having difficulty calling it cleanly. The compiler will refuse to perform two implicit conversions (const char* ➝ std::string ➝ std::optional<std::string>) to call it with a raw C-string literal. I can do this:

func(std::string("Hello"));

And the compiler will figure that a std::optional is needed, and do the conversion. However, this is way too verbose. Thanks to C++11, I can also do this:

func({"Hello"});

While this is way better, it's still not ideal. I'd like to be able to call this function like any other that takes a std::string. Is this possible? Making the function take another parameter type is okay, as long as it behaves similarly to/is directly convertible to std::optional. Thanks.