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| <a name="Characters"></a> |
| <h3 class="section">4.4 Characters</h3> |
| |
| <ul> |
| <li> <cite>The number of bits in a byte (C90 3.4, C99 and C11 3.6).</cite> |
| |
| <p>Determined by ABI. |
| </p> |
| </li><li> <cite>The values of the members of the execution character set (C90, |
| C99 and C11 5.2.1).</cite> |
| |
| <p>Determined by ABI. |
| </p> |
| </li><li> <cite>The unique value of the member of the execution character set produced |
| for each of the standard alphabetic escape sequences (C90, C99 and C11 |
| 5.2.2).</cite> |
| |
| <p>Determined by ABI. |
| </p> |
| </li><li> <cite>The value of a <code>char</code> object into which has been stored any |
| character other than a member of the basic execution character set |
| (C90 6.1.2.5, C99 and C11 6.2.5).</cite> |
| |
| <p>Determined by ABI. |
| </p> |
| </li><li> <cite>Which of <code>signed char</code> or <code>unsigned char</code> has the same |
| range, representation, and behavior as “plain” <code>char</code> (C90 |
| 6.1.2.5, C90 6.2.1.1, C99 and C11 6.2.5, C99 and C11 6.3.1.1).</cite> |
| |
| <a name="index-fsigned_002dchar-1"></a> |
| <a name="index-funsigned_002dchar-1"></a> |
| <p>Determined by ABI. The options <samp>-funsigned-char</samp> and |
| <samp>-fsigned-char</samp> change the default. See <a href="C-Dialect-Options.html#C-Dialect-Options">Options Controlling C Dialect</a>. |
| </p> |
| </li><li> <cite>The mapping of members of the source character set (in character |
| constants and string literals) to members of the execution character |
| set (C90 6.1.3.4, C99 and C11 6.4.4.4, C90, C99 and C11 5.1.1.2).</cite> |
| |
| <p>Determined by ABI. |
| </p> |
| </li><li> <cite>The value of an integer character constant containing more than one |
| character or containing a character or escape sequence that does not map |
| to a single-byte execution character (C90 6.1.3.4, C99 and C11 6.4.4.4).</cite> |
| |
| <p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined |
| behavior</a> in <cite>The C Preprocessor</cite>. |
| </p> |
| </li><li> <cite>The value of a wide character constant containing more than one |
| multibyte character or a single multibyte character that maps to |
| multiple members of the extended execution character set, or |
| containing a multibyte character or escape sequence not represented in |
| the extended execution character set (C90 6.1.3.4, C99 and C11 |
| 6.4.4.4).</cite> |
| |
| <p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined |
| behavior</a> in <cite>The C Preprocessor</cite>. |
| </p> |
| </li><li> <cite>The current locale used to convert a wide character constant consisting |
| of a single multibyte character that maps to a member of the extended |
| execution character set into a corresponding wide character code (C90 |
| 6.1.3.4, C99 and C11 6.4.4.4).</cite> |
| |
| <p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined |
| behavior</a> in <cite>The C Preprocessor</cite>. |
| </p> |
| </li><li> <cite>Whether differently-prefixed wide string literal tokens can be |
| concatenated and, if so, the treatment of the resulting multibyte |
| character sequence (C11 6.4.5).</cite> |
| |
| <p>Such tokens may not be concatenated. |
| </p> |
| </li><li> <cite>The current locale used to convert a wide string literal into |
| corresponding wide character codes (C90 6.1.4, C99 and C11 6.4.5).</cite> |
| |
| <p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined |
| behavior</a> in <cite>The C Preprocessor</cite>. |
| </p> |
| </li><li> <cite>The value of a string literal containing a multibyte character or escape |
| sequence not represented in the execution character set (C90 6.1.4, |
| C99 and C11 6.4.5).</cite> |
| |
| <p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined |
| behavior</a> in <cite>The C Preprocessor</cite>. |
| </p> |
| </li><li> <cite>The encoding of any of <code>wchar_t</code>, <code>char16_t</code>, and |
| <code>char32_t</code> where the corresponding standard encoding macro |
| (<code>__STDC_ISO_10646__</code>, <code>__STDC_UTF_16__</code>, or |
| <code>__STDC_UTF_32__</code>) is not defined (C11 6.10.8.2).</cite> |
| |
| <p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined |
| behavior</a> in <cite>The C Preprocessor</cite>. <code>char16_t</code> and |
| <code>char32_t</code> literals are always encoded in UTF-16 and UTF-32 |
| respectively. |
| </p> |
| </li></ul> |
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