ncbi_limits.hpp
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- /*
- * ===========================================================================
- * PRODUCTION $Log: ncbi_limits.hpp,v $
- * PRODUCTION Revision 1000.1 2004/06/01 19:07:36 gouriano
- * PRODUCTION PRODUCTION: UPGRADED [GCC34_MSVC7] Dev-tree R1.7
- * PRODUCTION
- * ===========================================================================
- */
- #ifndef NCBI_LIMITS__HPP
- #define NCBI_LIMITS__HPP
- /* $Id: ncbi_limits.hpp,v 1000.1 2004/06/01 19:07:36 gouriano Exp $
- * ===========================================================================
- *
- * PUBLIC DOMAIN NOTICE
- * National Center for Biotechnology Information
- *
- * This software/database is a "United States Government Work" under the
- * terms of the United States Copyright Act. It was written as part of
- * the author's official duties as a United States Government employee and
- * thus cannot be copyrighted. This software/database is freely available
- * to the public for use. The National Library of Medicine and the U.S.
- * Government have not placed any restriction on its use or reproduction.
- *
- * Although all reasonable efforts have been taken to ensure the accuracy
- * and reliability of the software and data, the NLM and the U.S.
- * Government do not and cannot warrant the performance or results that
- * may be obtained by using this software or data. The NLM and the U.S.
- * Government disclaim all warranties, express or implied, including
- * warranties of performance, merchantability or fitness for any particular
- * purpose.
- *
- * Please cite the author in any work or product based on this material.
- *
- * ===========================================================================
- *
- * Author: Denis Vakatov
- *
- * File Description:
- *
- * Temporary replacement for "numeric_limits<>".
- * Extremely incomplete implementation,
- *
- * only min() and max() methods for:
- *
- * numeric_limits<char>
- * numeric_limits<signed char>
- * numeric_limits<unsigned char>
- *
- * numeric_limits<signed short>
- * numeric_limits<unsigned short>
- * numeric_limits<signed int>
- * numeric_limits<unsigned int>
- * numeric_limits<signed long>
- * numeric_limits<unsigned long>
- *
- * numeric_limits<float>
- * numeric_limits<double>
- *
- * (platform-specific)
- * numeric_limits<signed long long>
- * numeric_limits<unsigned long long>
- * numeric_limits<signed __int64>
- * numeric_limits<unsigned __int64>
- *
- */
- #include <corelib/ncbistd.hpp>
- #include <corelib/ncbi_limits.h>
- /** @addtogroup Portability
- *
- * @{
- */
- #if defined(HAVE_LIMITS) && !defined(NCBI_COMPILER_WORKSHOP)
- // Ideally, we would use std::numeric_limits<> whenever available.
- // However, certain compilers leave out support for extensions such as
- // long long, so we still have to use our implementation with them.
- # include <limits>
- #else
- BEGIN_NCBI_SCOPE
- ///
- /// Pre-declaration of the "numeric_limits<>" template
- /// Forcibly overrides (using preprocessor) the original "numeric_limits<>"!
- ///
- # define numeric_limits ncbi_numeric_limits
- template <class T> class numeric_limits;
- ///
- /// Auxiliary macro to implement (a limited edition of) the
- /// "numeric_limits<>" template
- ///
- # define NCBI_NUMERIC_LIMITS(type, alias)
- template <>
- class numeric_limits<type>
- {
- public:
- static inline type min() THROWS_NONE { return kMin_##alias; }
- static inline type max() THROWS_NONE { return kMax_##alias; }
- }
- # define NCBI_NUMERIC_LIMITS_UNSIGNED(type, alias)
- template <>
- class numeric_limits<type>
- {
- public:
- static inline type min() THROWS_NONE { return 0; }
- static inline type max() THROWS_NONE { return kMax_##alias; }
- }
- //
- // Implement (a limited edition of) the "numeric_limits<>" template
- // for various built-in types
- //
- NCBI_NUMERIC_LIMITS ( char, Char);
- NCBI_NUMERIC_LIMITS (signed char, SChar);
- NCBI_NUMERIC_LIMITS_UNSIGNED (unsigned char, UChar);
- NCBI_NUMERIC_LIMITS (signed short, Short);
- NCBI_NUMERIC_LIMITS_UNSIGNED (unsigned short, UShort);
- NCBI_NUMERIC_LIMITS (signed int, Int);
- NCBI_NUMERIC_LIMITS_UNSIGNED (unsigned int, UInt);
- NCBI_NUMERIC_LIMITS (signed long, Long);
- NCBI_NUMERIC_LIMITS_UNSIGNED (unsigned long, ULong);
- NCBI_NUMERIC_LIMITS (float, Float);
- NCBI_NUMERIC_LIMITS (double, Double);
- # if (SIZEOF_LONG_LONG > 0)
- NCBI_NUMERIC_LIMITS (signed long long, LongLong);
- NCBI_NUMERIC_LIMITS_UNSIGNED (unsigned long long, ULongLong);
- # endif
- # if defined(NCBI_USE_INT64)
- NCBI_NUMERIC_LIMITS (signed __int64, Int64);
- NCBI_NUMERIC_LIMITS_UNSIGNED (unsigned __int64, UInt64);
- # endif
- END_NCBI_SCOPE
- #endif // !HAVE_LIMITS || NCBI_COMPILER_WORKSHOP
- BEGIN_NCBI_SCOPE
- /// Generic template to get STD limits by a variable.
- /// Typical use:
- /// <pre>
- /// int a = 10;
- ///
- /// @note
- /// Causes a compile-time failure if used
- /// instead of the specialized implementations.
- template<typename T>
- inline numeric_limits<T> get_limits(const T&)
- {
- typename T::TypeIsNotSupported tmp;
- return numeric_limits<T>();
- }
- /// Macro to declare specilized get_limits
- # define NCBI_GET_NUMERIC_LIMITS(type)
- EMPTY_TEMPLATE
- inline numeric_limits<type> get_limits(const type&)
- { return numeric_limits<type>(); }
- NCBI_GET_NUMERIC_LIMITS( char)
- NCBI_GET_NUMERIC_LIMITS(signed char)
- NCBI_GET_NUMERIC_LIMITS(unsigned char)
- NCBI_GET_NUMERIC_LIMITS(signed short)
- NCBI_GET_NUMERIC_LIMITS(unsigned short)
- NCBI_GET_NUMERIC_LIMITS(signed int)
- NCBI_GET_NUMERIC_LIMITS(unsigned int)
- NCBI_GET_NUMERIC_LIMITS(signed long)
- NCBI_GET_NUMERIC_LIMITS(unsigned long)
- NCBI_GET_NUMERIC_LIMITS(float)
- NCBI_GET_NUMERIC_LIMITS(double)
- # if (SIZEOF_LONG_LONG > 0)
- NCBI_GET_NUMERIC_LIMITS(signed long long)
- NCBI_GET_NUMERIC_LIMITS(unsigned long long)
- # endif
- # if defined(NCBI_USE_INT64)
- NCBI_GET_NUMERIC_LIMITS(signed __int64)
- NCBI_GET_NUMERIC_LIMITS(unsigned __int64)
- # endif
- END_NCBI_SCOPE
- /* @} */
- /*
- * ==========================================================================
- * $Log: ncbi_limits.hpp,v $
- * Revision 1000.1 2004/06/01 19:07:36 gouriano
- * PRODUCTION: UPGRADED [GCC34_MSVC7] Dev-tree R1.7
- *
- * Revision 1.7 2004/06/01 12:09:45 kuznets
- * + get_limits
- *
- * Revision 1.6 2003/04/01 14:18:50 siyan
- * Added doxygen support
- *
- * Revision 1.5 2002/11/04 21:47:56 ucko
- * Use system numeric_limits<> whenever <limits> exists, except on
- * WorkShop (which has "long long" but not numeric_limits<long long>).
- *
- * Revision 1.4 2002/04/11 20:39:15 ivanov
- * CVS log moved to end of the file
- *
- * Revision 1.3 2002/02/14 17:15:44 kans
- * use standard numeric limits on MacOS (AU)
- *
- * Revision 1.2 2001/05/30 16:17:23 vakatov
- * Introduced #NCBI_USE_INT64 -- in oreder to use "__int64" type
- * only when absolutely necessary (otherwise it conflicted with
- * "long long" for the Intel C++ compiler).
- *
- * Revision 1.1 2001/01/03 17:35:23 vakatov
- * Initial revision
- *
- * ==========================================================================
- */
- #endif /* NCBI_LIMITS__HPP */