晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/include/OpenEXR/ImathNamespace.h
///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2012, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
// *       Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// *       Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// *       Neither the name of Industrial Light & Magic nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission. 
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
///////////////////////////////////////////////////////////////////////////

#ifndef INCLUDED_IMATHNAMESPACE_H
#define INCLUDED_IMATHNAMESPACE_H

//
// The purpose of this file is to make it possible to specify an
// IMATH_INTERNAL_NAMESPACE as a preprocessor definition and have all of the
// Imath symbols defined within that namespace rather than the standard
// Imath namespace.  Those symbols are made available to client code through
// the IMATH_NAMESPACE in addition to the IMATH_INTERNAL_NAMESPACE.
//
// To ensure source code compatibility, the IMATH_NAMESPACE defaults to Imath
// and then "using namespace IMATH_INTERNAL_NAMESPACE;" brings all of the
// declarations from the IMATH_INTERNAL_NAMESPACE into the IMATH_NAMESPACE.
// This means that client code can continue to use syntax like Imath::V3f,
// but at link time it will resolve to a mangled symbol based on the
// IMATH_INTERNAL_NAMESPACE.
//
// As an example, if one needed to build against a newer version of Imath and
// have it run alongside an older version in the same application, it is now
// possible to use an internal namespace to prevent collisions between the
// older versions of Imath symbols and the newer ones.  To do this, the
// following could be defined at build time:
//
// IMATH_INTERNAL_NAMESPACE = Imath_v2
//
// This means that declarations inside Imath headers look like this (after
// the preprocessor has done its work):
//
// namespace Imath_v2 {
//     ...
//     class declarations
//     ...
// }
//
// namespace Imath {
//     using namespace Imath_v2;
// }
//

//
// Open Source version of this file pulls in the IlmBaseConfig.h file
// for the configure time options.
//
#include "IlmBaseConfig.h"


#ifndef IMATH_NAMESPACE
#define IMATH_NAMESPACE Imath
#endif

#ifndef IMATH_INTERNAL_NAMESPACE
#define IMATH_INTERNAL_NAMESPACE IMATH_NAMESPACE
#endif

//
// We need to be sure that we import the internal namespace into the public one.
// To do this, we use the small bit of code below which initially defines
// IMATH_INTERNAL_NAMESPACE (so it can be referenced) and then defines
// IMATH_NAMESPACE and pulls the internal symbols into the public
// namespace.
//

namespace IMATH_INTERNAL_NAMESPACE {}
namespace IMATH_NAMESPACE {
     using namespace IMATH_INTERNAL_NAMESPACE;
}

//
// There are identical pairs of HEADER/SOURCE ENTER/EXIT macros so that
// future extension to the namespace mechanism is possible without changing
// project source code.
//

#define IMATH_INTERNAL_NAMESPACE_HEADER_ENTER namespace IMATH_INTERNAL_NAMESPACE {
#define IMATH_INTERNAL_NAMESPACE_HEADER_EXIT }

#define IMATH_INTERNAL_NAMESPACE_SOURCE_ENTER namespace IMATH_INTERNAL_NAMESPACE {
#define IMATH_INTERNAL_NAMESPACE_SOURCE_EXIT }


#endif /* INCLUDED_IMATHNAMESPACE_H */

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