Why do I keep getting errors with the string?

Question

I'm building the UI for the health

   //New   -----------------------      
const wchar_std::wstring output = std::wstring(L"Player-Health:") + std::wstring(m_player->health);

This std::wstring(m_player->health) has this error:

Error (active) E0289 no instance of constructor "std::basic_string<_Elem, _Traits, _Alloc>::basic_string [with _Elem=wchar_t, _Traits=std::char_traits<wchar_t>, _Alloc=std::allocator<wchar_t>]" matches the argument list "

Answer 1

I assume that wchar_std::wstring is a typo and should be just std::wstring

Other than that I guess that m_player->health is a std::string rather than a std::wstring.

Answer 2

Hi,

You could use to_wstring

	const std::wstring output = std::wstring(L"Player-Health:") + std::to_wstring(m_player->health);

Best regards,

Minxin Yu

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Answer 3

The following part of the error message: "std::basic_string<_Elem, _Traits, _Alloc>::basic_string [with _Elem=wchar_t, _Traits=std::char_traits<wchar_t>, _Alloc=std::allocator<wchar_t>]"

is basically a very verbose way to identify std::wstring. It's kind of "std::wstring as seen from the C++ compiler's glasses".

In simple terms, the C++ compiler with that error message is basically telling you that it can't find a proper std::wstring constructor to build a std::wstring instance from the m_player->health.

So, the question now is: What is the type of m_player->health ?

If it's a numeric value like an int, or float, or double, etc. you may simply invoke std::to_wstring to convert it to a std::wstring instance.

If it's an instance of std::string, you should clarify what encoding is used to represent the text, and properly convert from that encoding to Unicode UTF-16 to store the text in std::wstring. To do that, you can invoke the MultiByteToWideChar API, or reuse some available open-source Unicode conversion code.