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Showing content from https://en.cppreference.com/w/cpp/algorithm/../error/../locale/wstring_convert/from_bytes.html below:

std::wstring_convert<Codecvt,Elem,Wide_alloc,Byte_alloc>::from_bytes - cppreference.com

wide_string from_bytes( char byte );

(1)

wide_string from_bytes( const char* ptr );

(2)

wide_string from_bytes( const byte_string& str );

(3)

wide_string from_bytes( const char* first, const char* last );

(4)

Converts a byte sequence to a wide string using the facet pointed to by cvtptr .

1) The byte sequence only consists of one element byte.

2) The byte sequence is the null-terminated sequence beginning at ptr.

3) The byte sequence is the sequence contained in str.

4) The byte sequence is the range [firstlast).

Before the conversion begins, if *this was not constructed with constructor overload (3), cvtstate will be set to its default value (the initial conversion state).

The number of input elements successfully converted will be stored in cvtcount .

[edit] Return value

If the conversion succeeds, returns the conversion result. Otherwise, if *this is constructed with constructor overload (4), returns wide_err_string.

[edit] Exceptions

If the conversion fails and *this was not constructed with constructor overload (4), throws std::range_error.

[edit] Example

Output:

UTF-16 conversion produced 5 code units: 0x7a 0xdf 0x6c34 0xd834 0xdd0b
UTF-32 conversion produced 4 code units: 0x7a 0xdf 0x6c34 0x1d10b
[edit] See also converts a wide string into a byte string
(public member function) [edit] converts a narrow multibyte character string to wide string, given state
(function) [edit] converts a string from ExternT to InternT, such as when reading from file
(virtual protected member function of std::codecvt<InternT,ExternT,StateT>) [edit]

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