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std:: to_wstring

From cppreference.net
C++
Strings library
std::basic_string
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 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 ) .
(until C++26)
1-9) Converts a numeric value to a wide string as if by std:: format ( L "{}" , value ) .
(since C++26)

Contents

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

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