Mercurial > projects > ldc
view druntime/src/common/core/vararg.d @ 1458:e0b2d67cfe7c
Added druntime (this should be removed once it works).
author | Robert Clipsham <robert@octarineparrot.com> |
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date | Tue, 02 Jun 2009 17:43:06 +0100 |
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/** * The vararg module is intended to facilitate vararg manipulation in D. * It should be interface compatible with the C module "stdarg," and the * two modules may share a common implementation if possible (as is done * here). * Copyright: Copyright Digital Mars 2000 - 2009. * License: <a href="http://www.boost.org/LICENSE_1_0.txt>Boost License 1.0</a>. * Authors: Walter Bright, Hauke Duden * * Copyright Digital Mars 2000 - 2009. * Distributed under the Boost Software License, Version 1.0. * (See accompanying file LICENSE_1_0.txt or copy at * http://www.boost.org/LICENSE_1_0.txt) */ module core.vararg; /** * The base vararg list type. */ alias void* va_list; /** * This function initializes the supplied argument pointer for subsequent * use by va_arg and va_end. * * Params: * ap = The argument pointer to initialize. * paramn = The identifier of the rightmost parameter in the function * parameter list. */ void va_start(T) ( out va_list ap, inout T parmn ) { ap = cast(va_list) ( cast(void*) &parmn + ( ( T.sizeof + int.sizeof - 1 ) & ~( int.sizeof - 1 ) ) ); } /** * This function returns the next argument in the sequence referenced by * the supplied argument pointer. The argument pointer will be adjusted * to point to the next arggument in the sequence. * * Params: * ap = The argument pointer. * * Returns: * The next argument in the sequence. The result is undefined if ap * does not point to a valid argument. */ T va_arg(T) ( inout va_list ap ) { T arg = *cast(T*) ap; ap = cast(va_list) ( cast(void*) ap + ( ( T.sizeof + int.sizeof - 1 ) & ~( int.sizeof - 1 ) ) ); return arg; } /** * This function cleans up any resources allocated by va_start. It is * currently a no-op and exists mostly for syntax compatibility with * the variadric argument functions for C. * * Params: * ap = The argument pointer. */ void va_end( va_list ap ) { } /** * This function copied the argument pointer src to dst. * * Params: * src = The source pointer. * dst = The destination pointer. */ void va_copy( out va_list dst, va_list src ) { dst = src; }