std::to_wstring

 

C++

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Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

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Filesystem library (C++17)

Regular expressions library (C++11)

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Technical Specifications

 

Strings library

Null-terminated strings

Byte strings

Multibyte strings

Wide strings

Classes

basic_string

basic_string_view (C++17)

char_traits

 

std::basic_string

Member functions basic_string::basic_string basic_string::operator= basic_string::assign basic_string::get_allocator Element access basic_string::at basic_string::operator[] basic_string::front (C++11) basic_string::back (C++11) basic_string::data basic_string::c_str basic_string::operator basic_string_view (C++17)   Iterators basic_string::beginbasic_string::cbegin (C++11) basic_string::endbasic_string::cend (C++11) basic_string::rbeginbasic_string::crbegin (C++11) basic_string::rendbasic_string::crend (C++11) Capacity basic_string::empty basic_string::sizebasic_string::length basic_string::max_size basic_string::reserve basic_string::capacity basic_string::shrink_to_fit (C++11)

Operations basic_string::clear basic_string::insert basic_string::erase basic_string::push_back basic_string::pop_back (C++11) basic_string::append basic_string::operator+= basic_string::compare basic_string::starts_with (C++20)   basic_string::ends_with (C++20) basic_string::contains (C++23) basic_string::replace basic_string::substr basic_string::copy basic_string::resize basic_string::swap Search basic_string::find basic_string::rfind basic_string::find_first_of basic_string::find_first_not_of basic_string::find_last_of basic_string::find_last_not_of Constants basic_string::npos

Non-member functions operator+ swap(std::basic_string) operator""s (C++14) erase(std::basic_string)erase_if(std::basic_string) (C++20)(C++20) I/O operator<<operator>> getline Comparison operator==operator!=operator<operator>operator<=operator>=operator<=> (until C++20)(until C++20)(until C++20)(until C++20)(until C++20)(C++20) Numeric conversion (C++11) stoistolstoll stoulstoull stofstodstold to_string to_wstring Helper classes hash<std::string>hash<std::wstring>hash<std::u32string>hash<std::u16string>hash<std::u8string> (C++11)  (C++11)(C++11)(C++11)(C++20) hash<std::pmr::string>hash<std::pmr::wstring>hash<std::pmr::u32string>hash<std::pmr::u16string>hash<std::pmr::u8string> (C++17)(C++17)(C++17)(C++17)(C++20) Deduction guides (C++17)

 

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>
 
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

See also

to_string (C++11)

converts an integral or floating point value to string (function)