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VS 2017 C++ compiler cannot find matching function was OK in VS 2005 [closed]

I am getting

"error C3861: 'to8Bit': identifier not found" in this situation:

typedef struct _ustruct2

int which;
union

double d;
tstring * s;
bool b;
char e;
uu;
ustruct2;

std::string to8Bit(const std::string &s);
std::string to8Bit(const std::string s);
std::string to8Bit(const tstring s);
std::string to8Bit(tstring s);
std::string to8Bit(tstring &s);
std::string to8Bit(wchar_t * pc);
std::string to8Bit(const tstring &s);
std::string to8Bit(const char * pc, int len = -1);
std::string to8Bit(const wchar_t * pc, int len = -1);

static void outputustruct(FILE * opmte, int i, const char * s, const ustruct2 &u)

std::string mys2 = to8Bit((*u.uu.s).c_str());



There are some other versions of to8BIT that I don't think are needed in this post. But I would have thought one of these would match. I have tried getting rid of the const and/or the ampersand in the function outputustruct function header, and removing the asterisk in the call to to8Bit when the ampersand is removed. I have tried string and tstring in the struct definition and the code with the error on it, but nothing I do gets it to compile.

to8BIT

to8Bit

This code works fine in VS 2005 but not in VS 2017. In my experience MS tightens the compiler in later versions to more strictly conform to standards but I can't see what's causing the compiler error here.

This question appears to be off-topic. The users who voted to close gave this specific reason:

typedef struct _tagname

struct ustruct2 ...

1 Answer
1

C++11 std::wstring_convert (deprecated in C++17) provides a simple solution:

std::wstring_convert

In your case, tstring defined as:

#include <tchar.h> // For _TCHAR

typedef std::basic_string<_TCHAR> tstring;


it is possible to convert like this:

#include <locale>
#include <codecvt>

int main()

tstring string_to_convert = L"Follow the white rabbit";

// Converter setup:
using convert_type = std::codecvt_utf8<wchar_t>;
std::wstring_convert<convert_type, wchar_t> converter;

// Convert (.to_bytes: wstr->str, .from_bytes: str->wstr)
std::string converted_str = converter.to_bytes(string_to_convert);

return 0;



or in your case, something like:

#include <locale>
#include <codecvt>

static void outputustruct(FILE * opmte, int i, const char * s, const ustruct2 &u)

// Converter setup:
using convert_type = std::codecvt_utf8<wchar_t>;
std::wstring_convert<convert_type, wchar_t> converter;

// Convert:
string mys2 = converter.to_bytes(*u.uu.s);



(This works on VS2017 C++)