std::to_wstring

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[edit]

Strings library

Classes
basic_string
basic_string_view (C++17)
char_traits

[edit]

std::basic_string

Member functions
basic_string::basic_string
basic_string::~basic_string
basic_string::operator=
basic_string::assign
basic_string::assign_range (C++23)
basic_string::get_allocator
Element access
basic_string::at
basic_string::operator[]
basic_string::front (DR*)
basic_string::back (DR*)
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)
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

Modifiers
basic_string::clear
basic_string::insert
basic_string::insert_range (C++23)
basic_string::erase
basic_string::push_back
basic_string::pop_back (DR*)
basic_string::append
basic_string::append_range (C++23)
basic_string::operator+=
basic_string::replace
basic_string::replace_with_range (C++23)
basic_string::copy
basic_string::resize
basic_string::resize_and_overwrite (C++23)
basic_string::swap
Capacity
basic_string::empty
basic_string::sizebasic_string::length
basic_string::max_size
basic_string::reserve
basic_string::capacity
basic_string::shrink_to_fit (DR*)
Operations
basic_string::compare
basic_string::starts_with (C++20)
basic_string::ends_with (C++20)
basic_string::contains (C++23)
basic_string::substr

swap(std::basic_string)

erase(std::basic_string)erase_if(std::basic_string)

(C++20)(C++20)

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 conversions

stoistolstoll (C++11)(C++11)(C++11)
stoulstoull (C++11)(C++11)

stofstodstold (C++11)(C++11)(C++11)
to_string (C++11)
to_wstring (C++11)

Literals

operator""s

(C++14)

Helper classes

hash<std::basic_string>

(C++11)

Deduction guides(C++17)

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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(longlong value);	(3)	(since C++11)
std::wstring to_wstring(unsigned value);	(4)	(since C++11)
std::wstring to_wstring(unsignedlong value);	(5)	(since C++11)
std::wstring to_wstring(unsignedlonglong 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(longdouble value);	(9)	(since C++11)

Converts a numeric value tostd::wstring.

Letbuf 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 bystd::swprintf(buf, sz, L"%d", value).

2) Converts a signed decimal integer to a wide string as if bystd::swprintf(buf, sz, L"%ld", value).

3) Converts a signed decimal integer to a wide string as if bystd::swprintf(buf, sz, L"%lld", value).

4) Converts an unsigned decimal integer to a wide string as if bystd::swprintf(buf, sz, L"%u", value).

5) Converts an unsigned decimal integer to a wide string as if bystd::swprintf(buf, sz, L"%lu", value).

6) Converts an unsigned decimal integer to a wide string as if bystd::swprintf(buf, sz, L"%llu", value).

7,8) Converts a floating point value to a wide string as if bystd::swprintf(buf, sz, L"%f", value).

9) Converts a floating point value to a wide string as if bystd::swprintf(buf, sz, L"%Lf", value).

(until C++26)

1-9) Converts a numeric value to a wide string as if bystd::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 throwstd::bad_alloc from thestd::wstring constructor.

[edit]Example

Run this code

#include <iostream>#include <string> int main(){for(constdouble 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: 23.43to_wstring: 23.430000 std::wcout: 1e-09to_wstring: 0.000000 std::wcout: 1e+40to_wstring: 10000000000000000303786028427003666890752.000000 std::wcout: 1e-40to_wstring: 0.000000 std::wcout: 1.23457e+08to_wstring: 123456789.000000