std::to_wstring
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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)[edit] Parameters
value
-
a numeric value to convert
[edit] Return value
A wide string holding the converted value.
[edit] Exceptions
May throw std::bad_alloc from the std::wstring constructor.
[edit] 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