Squashed 'third_party/boostorg/lexical_cast/' content from commit 5bfe667
Change-Id: I518d0a0b83082059176813a98b80ad92892ac745
git-subtree-dir: third_party/boostorg/lexical_cast
git-subtree-split: 5bfe6672d467ebd8de5d911c07b2a931b43156de
diff --git a/include/boost/detail/basic_pointerbuf.hpp b/include/boost/detail/basic_pointerbuf.hpp
new file mode 100644
index 0000000..85618f9
--- /dev/null
+++ b/include/boost/detail/basic_pointerbuf.hpp
@@ -0,0 +1,139 @@
+//-----------------------------------------------------------------------------
+// boost detail/templated_streams.hpp header file
+// See http://www.boost.org for updates, documentation, and revision history.
+//-----------------------------------------------------------------------------
+//
+// Copyright (c) 2013 John Maddock, Antony Polukhin
+//
+//
+// 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)
+
+#ifndef BOOST_DETAIL_BASIC_POINTERBUF_HPP
+#define BOOST_DETAIL_BASIC_POINTERBUF_HPP
+
+// MS compatible compilers support #pragma once
+#if defined(_MSC_VER)
+# pragma once
+#endif
+
+#include "boost/config.hpp"
+#include <streambuf>
+
+namespace boost { namespace detail {
+
+//
+// class basic_pointerbuf:
+// acts as a stream buffer which wraps around a pair of pointers:
+//
+template <class charT, class BufferT >
+class basic_pointerbuf : public BufferT {
+protected:
+ typedef BufferT base_type;
+ typedef basic_pointerbuf<charT, BufferT> this_type;
+ typedef typename base_type::int_type int_type;
+ typedef typename base_type::char_type char_type;
+ typedef typename base_type::pos_type pos_type;
+ typedef ::std::streamsize streamsize;
+ typedef typename base_type::off_type off_type;
+
+public:
+ basic_pointerbuf() : base_type() { this_type::setbuf(0, 0); }
+ const charT* getnext() { return this->gptr(); }
+
+#ifndef BOOST_NO_USING_TEMPLATE
+ using base_type::pptr;
+ using base_type::pbase;
+#else
+ charT* pptr() const { return base_type::pptr(); }
+ charT* pbase() const { return base_type::pbase(); }
+#endif
+
+protected:
+ // VC mistakenly assumes that `setbuf` and other functions are not referenced.
+ // Marking those functions with `inline` suppresses the warnings.
+ // There must be no harm from marking virtual functions as inline: inline virtual
+ // call can be inlined ONLY when the compiler knows the "exact class".
+ inline base_type* setbuf(char_type* s, streamsize n);
+ inline typename this_type::pos_type seekpos(pos_type sp, ::std::ios_base::openmode which);
+ inline typename this_type::pos_type seekoff(off_type off, ::std::ios_base::seekdir way, ::std::ios_base::openmode which);
+
+private:
+ basic_pointerbuf& operator=(const basic_pointerbuf&);
+ basic_pointerbuf(const basic_pointerbuf&);
+};
+
+template<class charT, class BufferT>
+BufferT*
+basic_pointerbuf<charT, BufferT>::setbuf(char_type* s, streamsize n)
+{
+ this->setg(s, s, s + n);
+ return this;
+}
+
+template<class charT, class BufferT>
+typename basic_pointerbuf<charT, BufferT>::pos_type
+basic_pointerbuf<charT, BufferT>::seekoff(off_type off, ::std::ios_base::seekdir way, ::std::ios_base::openmode which)
+{
+ typedef typename boost::int_t<sizeof(way) * CHAR_BIT>::least cast_type;
+
+ if(which & ::std::ios_base::out)
+ return pos_type(off_type(-1));
+ std::ptrdiff_t size = this->egptr() - this->eback();
+ std::ptrdiff_t pos = this->gptr() - this->eback();
+ charT* g = this->eback();
+ switch(static_cast<cast_type>(way))
+ {
+ case ::std::ios_base::beg:
+ if((off < 0) || (off > size))
+ return pos_type(off_type(-1));
+ else
+ this->setg(g, g + off, g + size);
+ break;
+ case ::std::ios_base::end:
+ if((off < 0) || (off > size))
+ return pos_type(off_type(-1));
+ else
+ this->setg(g, g + size - off, g + size);
+ break;
+ case ::std::ios_base::cur:
+ {
+ std::ptrdiff_t newpos = static_cast<std::ptrdiff_t>(pos + off);
+ if((newpos < 0) || (newpos > size))
+ return pos_type(off_type(-1));
+ else
+ this->setg(g, g + newpos, g + size);
+ break;
+ }
+ default: ;
+ }
+#ifdef BOOST_MSVC
+#pragma warning(push)
+#pragma warning(disable:4244)
+#endif
+ return static_cast<pos_type>(this->gptr() - this->eback());
+#ifdef BOOST_MSVC
+#pragma warning(pop)
+#endif
+}
+
+template<class charT, class BufferT>
+typename basic_pointerbuf<charT, BufferT>::pos_type
+basic_pointerbuf<charT, BufferT>::seekpos(pos_type sp, ::std::ios_base::openmode which)
+{
+ if(which & ::std::ios_base::out)
+ return pos_type(off_type(-1));
+ off_type size = static_cast<off_type>(this->egptr() - this->eback());
+ charT* g = this->eback();
+ if(off_type(sp) <= size)
+ {
+ this->setg(g, g + off_type(sp), g + size);
+ }
+ return pos_type(off_type(-1));
+}
+
+}} // namespace boost::detail
+
+#endif // BOOST_DETAIL_BASIC_POINTERBUF_HPP
+
diff --git a/include/boost/detail/lcast_precision.hpp b/include/boost/detail/lcast_precision.hpp
new file mode 100644
index 0000000..2be88fd
--- /dev/null
+++ b/include/boost/detail/lcast_precision.hpp
@@ -0,0 +1,185 @@
+// Copyright Alexander Nasonov & Paul A. Bristow 2006.
+
+// Use, modification and distribution are subject to 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)
+
+#ifndef BOOST_DETAIL_LCAST_PRECISION_HPP_INCLUDED
+#define BOOST_DETAIL_LCAST_PRECISION_HPP_INCLUDED
+
+#include <climits>
+#include <ios>
+#include <limits>
+
+#include <boost/config.hpp>
+#include <boost/integer_traits.hpp>
+
+#ifndef BOOST_NO_IS_ABSTRACT
+// Fix for SF:1358600 - lexical_cast & pure virtual functions & VC 8 STL
+#include <boost/mpl/if.hpp>
+#include <boost/type_traits/is_abstract.hpp>
+#endif
+
+#if defined(BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS) || \
+ (defined(BOOST_MSVC) && (BOOST_MSVC<1310))
+
+#define BOOST_LCAST_NO_COMPILE_TIME_PRECISION
+#endif
+
+#ifdef BOOST_LCAST_NO_COMPILE_TIME_PRECISION
+#include <boost/assert.hpp>
+#else
+#include <boost/static_assert.hpp>
+#endif
+
+namespace boost { namespace detail {
+
+class lcast_abstract_stub {};
+
+#ifndef BOOST_LCAST_NO_COMPILE_TIME_PRECISION
+// Calculate an argument to pass to std::ios_base::precision from
+// lexical_cast. See alternative implementation for broken standard
+// libraries in lcast_get_precision below. Keep them in sync, please.
+template<class T>
+struct lcast_precision
+{
+#ifdef BOOST_NO_IS_ABSTRACT
+ typedef std::numeric_limits<T> limits; // No fix for SF:1358600.
+#else
+ typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_<
+ boost::is_abstract<T>
+ , std::numeric_limits<lcast_abstract_stub>
+ , std::numeric_limits<T>
+ >::type limits;
+#endif
+
+ BOOST_STATIC_CONSTANT(bool, use_default_precision =
+ !limits::is_specialized || limits::is_exact
+ );
+
+ BOOST_STATIC_CONSTANT(bool, is_specialized_bin =
+ !use_default_precision &&
+ limits::radix == 2 && limits::digits > 0
+ );
+
+ BOOST_STATIC_CONSTANT(bool, is_specialized_dec =
+ !use_default_precision &&
+ limits::radix == 10 && limits::digits10 > 0
+ );
+
+ BOOST_STATIC_CONSTANT(std::streamsize, streamsize_max =
+ boost::integer_traits<std::streamsize>::const_max
+ );
+
+ BOOST_STATIC_CONSTANT(unsigned int, precision_dec = limits::digits10 + 1U);
+
+ BOOST_STATIC_ASSERT(!is_specialized_dec ||
+ precision_dec <= streamsize_max + 0UL
+ );
+
+ BOOST_STATIC_CONSTANT(unsigned long, precision_bin =
+ 2UL + limits::digits * 30103UL / 100000UL
+ );
+
+ BOOST_STATIC_ASSERT(!is_specialized_bin ||
+ (limits::digits + 0UL < ULONG_MAX / 30103UL &&
+ precision_bin > limits::digits10 + 0UL &&
+ precision_bin <= streamsize_max + 0UL)
+ );
+
+ BOOST_STATIC_CONSTANT(std::streamsize, value =
+ is_specialized_bin ? precision_bin
+ : is_specialized_dec ? precision_dec : 6
+ );
+};
+#endif
+
+template<class T>
+inline std::streamsize lcast_get_precision(T* = 0)
+{
+#ifndef BOOST_LCAST_NO_COMPILE_TIME_PRECISION
+ return lcast_precision<T>::value;
+#else // Follow lcast_precision algorithm at run-time:
+
+#ifdef BOOST_NO_IS_ABSTRACT
+ typedef std::numeric_limits<T> limits; // No fix for SF:1358600.
+#else
+ typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_<
+ boost::is_abstract<T>
+ , std::numeric_limits<lcast_abstract_stub>
+ , std::numeric_limits<T>
+ >::type limits;
+#endif
+
+ bool const use_default_precision =
+ !limits::is_specialized || limits::is_exact;
+
+ if(!use_default_precision)
+ { // Includes all built-in floating-point types, float, double ...
+ // and UDT types for which digits (significand bits) is defined (not zero)
+
+ bool const is_specialized_bin =
+ limits::radix == 2 && limits::digits > 0;
+ bool const is_specialized_dec =
+ limits::radix == 10 && limits::digits10 > 0;
+ std::streamsize const streamsize_max =
+ (boost::integer_traits<std::streamsize>::max)();
+ (void)streamsize_max;
+
+ if(is_specialized_bin)
+ { // Floating-point types with
+ // limits::digits defined by the specialization.
+
+ unsigned long const digits = limits::digits;
+ unsigned long const precision = 2UL + digits * 30103UL / 100000UL;
+ // unsigned long is selected because it is at least 32-bits
+ // and thus ULONG_MAX / 30103UL is big enough for all types.
+ BOOST_ASSERT(
+ digits < ULONG_MAX / 30103UL &&
+ precision > limits::digits10 + 0UL &&
+ precision <= streamsize_max + 0UL
+ );
+ return precision;
+ }
+ else if(is_specialized_dec)
+ { // Decimal Floating-point type, most likely a User Defined Type
+ // rather than a real floating-point hardware type.
+ unsigned int const precision = limits::digits10 + 1U;
+ BOOST_ASSERT(precision <= streamsize_max + 0UL);
+ return precision;
+ }
+ }
+
+ // Integral type (for which precision has no effect)
+ // or type T for which limits is NOT specialized,
+ // so assume stream precision remains the default 6 decimal digits.
+ // Warning: if your User-defined Floating-point type T is NOT specialized,
+ // then you may lose accuracy by only using 6 decimal digits.
+ // To avoid this, you need to specialize T with either
+ // radix == 2 and digits == the number of significand bits,
+ // OR
+ // radix = 10 and digits10 == the number of decimal digits.
+
+ return 6;
+#endif
+}
+
+template<class T>
+inline void lcast_set_precision(std::ios_base& stream, T*)
+{
+ stream.precision(lcast_get_precision<T>());
+}
+
+template<class Source, class Target>
+inline void lcast_set_precision(std::ios_base& stream, Source*, Target*)
+{
+ std::streamsize const s = lcast_get_precision(static_cast<Source*>(0));
+ std::streamsize const t = lcast_get_precision(static_cast<Target*>(0));
+ stream.precision(s > t ? s : t);
+}
+
+}}
+
+#endif // BOOST_DETAIL_LCAST_PRECISION_HPP_INCLUDED
+