author | jjkang |
Wed, 23 Jun 2010 16:56:47 +0800 | |
changeset 590 | 360bd6b35136 |
parent 0 | 044383f39525 |
permissions | -rw-r--r-- |
0
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// Copyright Alexander Nasonov & Paul A. Bristow 2006. |
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// Use, modification and distribution are subject to the |
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// Boost Software License, Version 1.0. |
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// (See accompanying file LICENSE_1_0.txt |
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// or copy at http://www.boost.org/LICENSE_1_0.txt) |
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#ifndef BOOST_DETAIL_LCAST_PRECISION_HPP_INCLUDED |
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#define BOOST_DETAIL_LCAST_PRECISION_HPP_INCLUDED |
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#include <climits> |
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#include <ios> |
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#include <limits> |
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#include <boost/config.hpp> |
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#include <boost/integer_traits.hpp> |
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#ifndef BOOST_NO_IS_ABSTRACT |
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// Fix for SF:1358600 - lexical_cast & pure virtual functions & VC 8 STL |
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#include <boost/mpl/if.hpp> |
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#include <boost/type_traits/is_abstract.hpp> |
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#endif |
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#if defined(BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS) || \ |
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(defined(BOOST_MSVC) && (BOOST_MSVC<1310)) |
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#define BOOST_LCAST_NO_COMPILE_TIME_PRECISION |
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#endif |
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#ifdef BOOST_LCAST_NO_COMPILE_TIME_PRECISION |
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#include <boost/assert.hpp> |
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#else |
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#include <boost/static_assert.hpp> |
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#endif |
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namespace boost { namespace detail { |
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class lcast_abstract_stub {}; |
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#ifndef BOOST_LCAST_NO_COMPILE_TIME_PRECISION |
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// Calculate an argument to pass to std::ios_base::precision from |
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// lexical_cast. See alternative implementation for broken standard |
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// libraries in lcast_get_precision below. Keep them in sync, please. |
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template<class T> |
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struct lcast_precision |
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{ |
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#ifdef BOOST_NO_IS_ABSTRACT |
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typedef std::numeric_limits<T> limits; // No fix for SF:1358600. |
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#else |
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typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_< |
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boost::is_abstract<T> |
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, std::numeric_limits<lcast_abstract_stub> |
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, std::numeric_limits<T> |
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>::type limits; |
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#endif |
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BOOST_STATIC_CONSTANT(bool, use_default_precision = |
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!limits::is_specialized || limits::is_exact |
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); |
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BOOST_STATIC_CONSTANT(bool, is_specialized_bin = |
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!use_default_precision && |
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limits::radix == 2 && limits::digits > 0 |
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); |
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BOOST_STATIC_CONSTANT(bool, is_specialized_dec = |
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!use_default_precision && |
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limits::radix == 10 && limits::digits10 > 0 |
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); |
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BOOST_STATIC_CONSTANT(std::streamsize, streamsize_max = |
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boost::integer_traits<std::streamsize>::const_max |
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); |
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BOOST_STATIC_CONSTANT(unsigned int, precision_dec = limits::digits10 + 1U); |
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BOOST_STATIC_ASSERT(!is_specialized_dec || |
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precision_dec <= streamsize_max + 0UL |
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); |
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BOOST_STATIC_CONSTANT(unsigned long, precision_bin = |
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2UL + limits::digits * 30103UL / 100000UL |
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); |
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BOOST_STATIC_ASSERT(!is_specialized_bin || |
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(limits::digits + 0UL < ULONG_MAX / 30103UL && |
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precision_bin > limits::digits10 + 0UL && |
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precision_bin <= streamsize_max + 0UL) |
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); |
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BOOST_STATIC_CONSTANT(std::streamsize, value = |
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is_specialized_bin ? precision_bin |
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: is_specialized_dec ? precision_dec : 6 |
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); |
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}; |
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#endif |
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template<class T> |
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inline std::streamsize lcast_get_precision(T* = 0) |
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{ |
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#ifndef BOOST_LCAST_NO_COMPILE_TIME_PRECISION |
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return lcast_precision<T>::value; |
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#else // Follow lcast_precision algorithm at run-time: |
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#ifdef BOOST_NO_IS_ABSTRACT |
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typedef std::numeric_limits<T> limits; // No fix for SF:1358600. |
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#else |
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typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_< |
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boost::is_abstract<T> |
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, std::numeric_limits<lcast_abstract_stub> |
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, std::numeric_limits<T> |
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>::type limits; |
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#endif |
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bool const use_default_precision = |
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!limits::is_specialized || limits::is_exact; |
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|
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if(!use_default_precision) |
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{ // Includes all built-in floating-point types, float, double ... |
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// and UDT types for which digits (significand bits) is defined (not zero) |
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|
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bool const is_specialized_bin = |
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limits::radix == 2 && limits::digits > 0; |
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bool const is_specialized_dec = |
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limits::radix == 10 && limits::digits10 > 0; |
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std::streamsize const streamsize_max = |
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(boost::integer_traits<std::streamsize>::max)(); |
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if(is_specialized_bin) |
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{ // Floating-point types with |
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// limits::digits defined by the specialization. |
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unsigned long const digits = limits::digits; |
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unsigned long const precision = 2UL + digits * 30103UL / 100000UL; |
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// unsigned long is selected because it is at least 32-bits |
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// and thus ULONG_MAX / 30103UL is big enough for all types. |
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BOOST_ASSERT( |
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digits < ULONG_MAX / 30103UL && |
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precision > limits::digits10 + 0UL && |
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precision <= streamsize_max + 0UL |
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); |
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return precision; |
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} |
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else if(is_specialized_dec) |
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{ // Decimal Floating-point type, most likely a User Defined Type |
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// rather than a real floating-point hardware type. |
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unsigned int const precision = limits::digits10 + 1U; |
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BOOST_ASSERT(precision <= streamsize_max + 0UL); |
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return precision; |
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} |
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} |
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152 |
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// Integral type (for which precision has no effect) |
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// or type T for which limits is NOT specialized, |
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// so assume stream precision remains the default 6 decimal digits. |
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// Warning: if your User-defined Floating-point type T is NOT specialized, |
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// then you may lose accuracy by only using 6 decimal digits. |
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// To avoid this, you need to specialize T with either |
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// radix == 2 and digits == the number of significand bits, |
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// OR |
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// radix = 10 and digits10 == the number of decimal digits. |
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162 |
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return 6; |
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#endif |
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} |
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166 |
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template<class T> |
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inline void lcast_set_precision(std::ios_base& stream, T*) |
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{ |
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stream.precision(lcast_get_precision<T>()); |
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} |
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template<class Source, class Target> |
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inline void lcast_set_precision(std::ios_base& stream, Source*, Target*) |
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{ |
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std::streamsize const s = lcast_get_precision((Source*)0); |
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std::streamsize const t = lcast_get_precision((Target*)0); |
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stream.precision(s > t ? s : t); |
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} |
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181 |
}} |
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#endif // BOOST_DETAIL_LCAST_PRECISION_HPP_INCLUDED |
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184 |