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96 lines
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96 lines
4.0 KiB
HTML
4 years ago
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<title>C++ Expressions - GNU Compiler Collection (GCC) Internals</title>
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<link rel="up" href="C-and-C_002b_002b-Trees.html#C-and-C_002b_002b-Trees" title="C and C++ Trees">
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<link rel="prev" href="Statements-for-C_002b_002b.html#Statements-for-C_002b_002b" title="Statements for C++">
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Copyright (C) 1988-2015 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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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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<div class="node">
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<a name="C++-Expressions"></a>
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<a name="C_002b_002b-Expressions"></a>
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<p>
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Previous: <a rel="previous" accesskey="p" href="Statements-for-C_002b_002b.html#Statements-for-C_002b_002b">Statements for C++</a>,
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Up: <a rel="up" accesskey="u" href="C-and-C_002b_002b-Trees.html#C-and-C_002b_002b-Trees">C and C++ Trees</a>
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<hr>
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</div>
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<h4 class="subsection">10.10.6 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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<dl>
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<dt><code>TYPEID_EXPR</code><dd>
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Used to represent a <code>typeid</code> expression.
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<br><dt><code>NEW_EXPR</code><dt><code>VEC_NEW_EXPR</code><dd>
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Used to represent a call to <code>new</code> and <code>new[]</code> respectively.
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<br><dt><code>DELETE_EXPR</code><dt><code>VEC_DELETE_EXPR</code><dd>
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Used to represent a call to <code>delete</code> and <code>delete[]</code> respectively.
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<br><dt><code>MEMBER_REF</code><dd>
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Represents a reference to a member of a class.
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<br><dt><code>THROW_EXPR</code><dd>
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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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<br><dt><code>AGGR_INIT_EXPR</code><dd>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>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>In either case, the expression is void.
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</dl>
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</body></html>
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