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139 lines
5.2 KiB
HTML
139 lines
5.2 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2018 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>C++ Expressions (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="C++ Expressions (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="C++ Expressions (GNU Compiler Collection (GCC) Internals)">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="C-and-C_002b_002b-Trees.html#C-and-C_002b_002b-Trees" rel="up" title="C and C++ Trees">
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<link href="Java-Trees.html#Java-Trees" rel="next" title="Java Trees">
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<link href="Statements-for-C_002b_002b.html#Statements-for-C_002b_002b" rel="prev" title="Statements for C++">
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</head>
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<body lang="en">
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<a name="C_002b_002b-Expressions"></a>
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<div class="header">
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<p>
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Previous: <a href="Statements-for-C_002b_002b.html#Statements-for-C_002b_002b" accesskey="p" rel="prev">Statements for C++</a>, Up: <a href="C-and-C_002b_002b-Trees.html#C-and-C_002b_002b-Trees" accesskey="u" rel="up">C and C++ Trees</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="C_002b_002b-Expressions-1"></a>
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<h4 class="subsection">11.10.6 C++ Expressions</h4>
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<p>This section describes expressions specific to the C and C++ front
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ends.
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</p>
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<dl compact="compact">
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<dt><code>TYPEID_EXPR</code></dt>
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<dd>
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<p>Used to represent a <code>typeid</code> expression.
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</p>
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</dd>
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<dt><code>NEW_EXPR</code></dt>
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<dt><code>VEC_NEW_EXPR</code></dt>
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<dd>
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<p>Used to represent a call to <code>new</code> and <code>new[]</code> respectively.
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</p>
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</dd>
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<dt><code>DELETE_EXPR</code></dt>
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<dt><code>VEC_DELETE_EXPR</code></dt>
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<dd>
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<p>Used to represent a call to <code>delete</code> and <code>delete[]</code> respectively.
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</p>
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</dd>
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<dt><code>MEMBER_REF</code></dt>
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<dd>
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<p>Represents a reference to a member of a class.
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</p>
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</dd>
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<dt><code>THROW_EXPR</code></dt>
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<dd>
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<p>Represents an instance of <code>throw</code> in the program. Operand 0,
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which is the expression to throw, may be <code>NULL_TREE</code>.
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</p>
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</dd>
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<dt><code>AGGR_INIT_EXPR</code></dt>
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<dd><p>An <code>AGGR_INIT_EXPR</code> represents the initialization as the return
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value of a function call, or as the result of a constructor. An
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<code>AGGR_INIT_EXPR</code> will only appear as a full-expression, or as the
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second operand of a <code>TARGET_EXPR</code>. <code>AGGR_INIT_EXPR</code>s have
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a representation similar to that of <code>CALL_EXPR</code>s. You can use
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the <code>AGGR_INIT_EXPR_FN</code> and <code>AGGR_INIT_EXPR_ARG</code> macros to access
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the function to call and the arguments to pass.
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</p>
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<p>If <code>AGGR_INIT_VIA_CTOR_P</code> holds of the <code>AGGR_INIT_EXPR</code>, then
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the initialization is via a constructor call. The address of the
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<code>AGGR_INIT_EXPR_SLOT</code> operand, which is always a <code>VAR_DECL</code>,
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is taken, and this value replaces the first argument in the argument
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list.
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</p>
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<p>In either case, the expression is void.
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</p>
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</dd>
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</dl>
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</body>
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</html>
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