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)