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std::to_wstring

From cppreference.com
< cpp‎ | string‎ | basic string
 
 
 
std::basic_string
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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.

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.

Contents

[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

#include <iostream>
#include <string>
 
template <typename T>
void print(T f)
{
    std::wcout << "std::wcout: " << f << L'\n'
               << "to_wstring: " << std::to_wstring(f) << L"\n\n";
}
 
int main() 
{
    print(23.43);
    print(1e-9);
    print(1e40);
    print(1e-40);
    print(123456789.0);
}

Output:

std::cout: 23.43
to_string: 23.430000
 
std::cout: 1e-09
to_string: 0.000000
 
std::cout: 1e+40
to_string: 10000000000000000303786028427003666890752.000000
 
std::cout: 1e-40
to_string: 0.000000
 
std::cout: 1.23457e+08
to_string: 123456789.000000

[edit] See also

(C++11)
converts an integral or floating point value to string
(function) [edit]