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.

1) Converts a signed decimal integer to a wide string with the same content as what
std::swprintf(buf, sz, L"%d", value) would produce for sufficiently large buf.
2) Converts a signed decimal integer to a wide string with the same content as what
std::swprintf(buf, sz, L"%ld", value) would produce for sufficiently large buf.
3) Converts a signed decimal integer to a wide string with the same content as what
std::swprintf(buf, sz, L"%lld", value) would produce for sufficiently large buf.
4) Converts an unsigned decimal integer to a wide string with the same content as
what
std::swprintf(buf, sz, L"%u", value) would produce for sufficiently large buf.
5) Converts an unsigned decimal integer to a wide string with the same content as
what
std::swprintf(buf, sz, L"%lu", value) would produce for sufficiently large buf.
6) Converts an unsigned decimal integer to a wide string with the same content as
what
std::swprintf(buf, sz, L"%llu", value) would produce for sufficiently large buf.
7,8) Converts a floating point value to a wide string with the same content as what
std::swprintf(buf, sz, L"%f", value) would produce for sufficiently large buf.
9) Converts a floating point value to a wide string with the same content as what
std::swprintf(buf, sz, L"%Lf", value) would produce for sufficiently large buf.

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. }) {
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