std::text_encoding::comp-name

 

C++

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Feature test macros (C++20)

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Concepts library (C++20)

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Technical specifications

Symbols index

External libraries

 

Text processing library

Localization library

Regular expressions library (C++11)

Formatting library (C++20)

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Byte strings

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Primitive numeric conversions

to_chars (C++17) to_chars_result (C++17) from_chars (C++17) from_chars_result (C++17) chars_format (C++17)

Text encoding identifications

text_encoding (C++26)

 

std::text_encoding

Member functions

Creation

text_encoding::text_encoding

text_encoding::literal

text_encoding::environment

Observers

text_encoding::mib

text_encoding::name

text_encoding::aliases

text_encoding::environment_is

Helpers

text_encoding::comp-name

Non-member functions

operator==(std::text_encoding)

Member types

text_encoding::id

text_encoding::aliases_view

Helper classes

hash<std::text_encoding>

 

static constexpr bool /*comp-name*/( std::string_view a, std::string_view b );		(since C++26) (exposition only*)

Compares two strings a and b encoded in ordinary literal encoding following the Unicode Charset Alias Matching rules.

Two strings are considered equal when comparing from left to right after:

• removing all non-alphanumeric characters,
• converting all letters to the same case, and
• removing any standalone sequences of '0' characters that do not immediately follow a numeric prefix. A numeric prefix consists of a non-zero digit ('1' through '9') optionally followed by one or more non-alphanumeric characters.

Here are the following examples:

static_assert(/*comp-name*/("UTF-8", "utf8") == true);
static_assert(/*comp-name*/("u.t.f-008", "utf8") == true);
static_assert(/*comp-name*/("ISO-8859-1", "iso88591") == true);
static_assert(/*comp-name*/("ut8", "utf8") == false);
static_assert(/*comp-name*/("utf-80", "utf8") == false);

Parameters

a, b

-

strings to compare

Return value

true if two strings compare equal as described above; false otherwise.