std::to_wstring(3)

NAME
std::to_wstring - std::to_wstring

Synopsis
   Defined in header <string>
   std::wstring to_wstring( int value ); (1) (since C++11)
   std::wstring to_wstring( long value ); (2) (since C++11)
   std::wstring to_wstring( long long value ); (3) (since C++11)
   std::wstring to_wstring( unsigned value ); (4) (since C++11)
   std::wstring to_wstring( unsigned long value ); (5) (since C++11)
   std::wstring to_wstring( unsigned long long value ); (6) (since C++11)
   std::wstring to_wstring( float value ); (7) (since C++11)
   std::wstring to_wstring( double value ); (8) (since C++11)
   std::wstring to_wstring( long double value ); (9) (since C++11)
   Converts a numeric value to std::wstring.
   Let buf be an internal to the conversion functions buffer,
   sufficiently large to contain the result of conversion.
   1) Converts a signed decimal integer to a wide string as if by
   std::swprintf(buf, sz, L"%d", value).
   2) Converts a signed decimal integer to a wide string as if by
   std::swprintf(buf, sz, L"%ld", value).
   3) Converts a signed decimal integer to a wide string as if by
   std::swprintf(buf, sz, L"%lld", value).
   4) Converts an unsigned decimal integer to a wide string as if by (until C++26)
   std::swprintf(buf, sz, L"%u", value).
   5) Converts an unsigned decimal integer to a wide string as if by
   std::swprintf(buf, sz, L"%lu", value).
   6) Converts an unsigned decimal integer to a wide string as if by
   std::swprintf(buf, sz, L"%llu", value).
   7,8) Converts a floating point value to a wide string as if by
   std::swprintf(buf, sz, L"%f", value).
   9) Converts a floating point value to a wide string as if by
   std::swprintf(buf, sz, L"%Lf", value).
   1-9) Converts a numeric value to a wide string as if by (since C++26)
   std::format(L"{}", value).

Parameters
   value - a numeric value to convert

Return value
   A wide string holding the converted value.

Exceptions
   May throw std::bad_alloc from the std::wstring constructor.

Example
// Run this code
 #include <iostream>
 #include <string>
 int main()
 {
     for (const double f : {23.43, 1e-9, 1e40, 1e-40, 123456789.0})
         std::wcout << "std::wcout: " << f << '\n'
                    << "to_wstring: " << std::to_wstring(f) << "\n\n";
 }

Output:
 std::wcout: 23.43
 to_wstring: 23.430000
 std::wcout: 1e-09
 to_wstring: 0.000000
 std::wcout: 1e+40
 to_wstring: 10000000000000000303786028427003666890752.000000
 std::wcout: 1e-40
 to_wstring: 0.000000
 std::wcout: 1.23457e+08
 to_wstring: 123456789.000000

See also
   to_string converts an integral or floating-point value to string
   (C++11) (function)