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author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Mon, 25 May 2020 18:13:55 +0900
parents 1830386684a0
children
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1 @c Copyright (C) 2009-2020 Free Software Foundation, Inc.
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2 @c This is part of the GCC manual.
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3 @c For copying conditions, see the file gcc.texi.
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4
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5 @node C++ Implementation
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6 @chapter C++ Implementation-Defined Behavior
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7 @cindex implementation-defined behavior, C++ language
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8
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9 A conforming implementation of ISO C++ is required to document its
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10 choice of behavior in each of the areas that are designated
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11 ``implementation defined''. The following lists all such areas,
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12 along with the section numbers from the ISO/IEC 14882:1998 and ISO/IEC
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13 14882:2003 standards. Some areas are only implementation-defined in
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14 one version of the standard.
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15
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16 Some choices depend on the externally determined ABI for the platform
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17 (including standard character encodings) which GCC follows; these are
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18 listed as ``determined by ABI'' below. @xref{Compatibility, , Binary
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19 Compatibility}, and @uref{http://gcc.gnu.org/readings.html}. Some
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20 choices are documented in the preprocessor manual.
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21 @xref{Implementation-defined behavior, , Implementation-defined
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22 behavior, cpp, The C Preprocessor}. Some choices are documented in
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23 the corresponding document for the C language. @xref{C
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24 Implementation}. Some choices are made by the library and operating
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25 system (or other environment when compiling for a freestanding
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26 environment); refer to their documentation for details.
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27
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28 @menu
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29 * Conditionally-supported behavior::
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30 * Exception handling::
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31 @end menu
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32
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33 @node Conditionally-supported behavior
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34 @section Conditionally-Supported Behavior
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35
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36 @cite{Each implementation shall include documentation that identifies
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37 all conditionally-supported constructs that it does not support (C++0x
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38 1.4).}
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39
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40 @itemize @bullet
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41 @item
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42 @cite{Whether an argument of class type with a non-trivial copy
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43 constructor or destructor can be passed to ... (C++0x 5.2.2).}
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44
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45 Such argument passing is supported, using the same
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46 pass-by-invisible-reference approach used for normal function
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47 arguments of such types.
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49 @end itemize
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51 @node Exception handling
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52 @section Exception Handling
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53
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54 @itemize @bullet
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55 @item
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56 @cite{In the situation where no matching handler is found, it is
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57 implementation-defined whether or not the stack is unwound before
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58 std::terminate() is called (C++98 15.5.1).}
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60 The stack is not unwound before std::terminate is called.
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62 @end itemize