318 lines
12 KiB
Plaintext
318 lines
12 KiB
Plaintext
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// (C) Copyright Howard Hinnant
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// (C) Copyright 2011 Vicente J. Botet Escriba
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// Use, modification and distribution are subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt).
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//
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/**
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* Duration formatting facet for output.
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*/
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#ifndef BOOST_CHRONO_IO_DURATION_PUT_HPP
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#define BOOST_CHRONO_IO_DURATION_PUT_HPP
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#include <boost/chrono/config.hpp>
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#include <boost/chrono/io/duration_units.hpp>
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#include <boost/chrono/process_cpu_clocks.hpp>
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#include <boost/assert.hpp>
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#include <locale>
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namespace boost
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{
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namespace chrono
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{
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namespace detail
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{
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template <class T>
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struct propagate {
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typedef T type;
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};
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template <>
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struct propagate<boost::int_least32_t> {
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typedef boost::int_least64_t type;
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};
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}
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/**
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* @tparam ChatT a character type
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* @tparam OutputIterator a model of @c OutputIterator
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*
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* The @c duration_put facet provides facilities for formatted output of duration values.
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* The member function of @c duration_put take a duration and format it into character string representation.
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*
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*/
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template <class CharT, class OutputIterator = std::ostreambuf_iterator<CharT> >
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class duration_put: public std::locale::facet
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{
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public:
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/**
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* Type of character the facet is instantiated on.
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*/
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typedef CharT char_type;
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/**
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* Type of character string passed to member functions.
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*/
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typedef std::basic_string<CharT> string_type;
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/**
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* Type of iterator used to write in the character buffer.
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*/
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typedef OutputIterator iter_type;
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/**
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* Construct a duration_put facet.
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* @param refs
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* @Effects Construct a duration_put facet.
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* If the @c refs argument is @c 0 then destruction of the object is
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* delegated to the @c locale, or locales, containing it. This allows
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* the user to ignore lifetime management issues. On the other had,
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* if @c refs is @c 1 then the object must be explicitly deleted;
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* the @c locale will not do so. In this case, the object can be
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* maintained across the lifetime of multiple locales.
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*/
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explicit duration_put(size_t refs = 0) :
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std::locale::facet(refs)
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{
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}
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/**
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*
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* @param s an output stream iterator
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* @param ios a reference to a ios_base
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* @param fill the character used as filler
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* @param d the duration
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* @param pattern begin of the formatting pattern
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* @param pat_end end of the formatting pattern
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*
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* @Effects Steps through the sequence from @c pattern to @c pat_end,
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* identifying characters that are part of a pattern sequence. Each character
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* that is not part of a pattern sequence is written to @c s immediately, and
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* each pattern sequence, as it is identified, results in a call to
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* @c put_value or @c put_unit;
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* thus, pattern elements and other characters are interleaved in the output
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* in the order in which they appear in the pattern. Pattern sequences are
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* identified by converting each character @c c to a @c char value as if by
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* @c ct.narrow(c,0), where @c ct is a reference to @c ctype<charT> obtained from
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* @c ios.getloc(). The first character of each sequence is equal to @c '%',
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* followed by a pattern specifier character @c spec, which can be @c 'v' for
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* the duration value or @c 'u' for the duration unit. .
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* For each valid pattern sequence identified, calls
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* <c>put_value(s, ios, fill, d)</c> or <c>put_unit(s, ios, fill, d)</c>.
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*
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* @Returns An iterator pointing immediately after the last character produced.
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*/
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template <typename Rep, typename Period>
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iter_type put(iter_type s, std::ios_base& ios, char_type fill, duration<Rep, Period> const& d, const CharT* pattern,
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const CharT* pat_end, const char_type* val = 0) const
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{
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if (std::has_facet<duration_units<CharT> >(ios.getloc()))
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{
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duration_units<CharT> const&facet = std::use_facet<duration_units<CharT> >(
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ios.getloc());
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return put(facet, s, ios, fill, d, pattern, pat_end, val);
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}
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else
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{
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duration_units_default<CharT> facet;
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return put(facet, s, ios, fill, d, pattern, pat_end, val);
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}
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}
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template <typename Rep, typename Period>
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iter_type put(duration_units<CharT> const& units_facet, iter_type s, std::ios_base& ios, char_type fill,
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duration<Rep, Period> const& d, const CharT* pattern, const CharT* pat_end, const char_type* val = 0) const
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{
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const std::ctype<char_type>& ct = std::use_facet<std::ctype<char_type> >(ios.getloc());
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for (; pattern != pat_end; ++pattern)
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{
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if (ct.narrow(*pattern, 0) == '%')
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{
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if (++pattern == pat_end)
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{
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*s++ = pattern[-1];
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break;
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}
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char fmt = ct.narrow(*pattern, 0);
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switch (fmt)
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{
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case 'v':
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{
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s = put_value(s, ios, fill, d, val);
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break;
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}
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case 'u':
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{
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s = put_unit(units_facet, s, ios, fill, d);
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break;
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}
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default:
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BOOST_ASSERT(false && "Boost::Chrono internal error.");
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break;
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}
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}
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else
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*s++ = *pattern;
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}
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return s;
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}
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/**
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*
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* @param s an output stream iterator
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* @param ios a reference to a ios_base
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* @param fill the character used as filler
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* @param d the duration
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* @Effects imbue in @c ios the @c duration_units_default facet if not already present.
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* Retrieves Stores the duration pattern from the @c duration_unit facet in let say @c str. Last as if
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* @code
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* return put(s, ios, d, str.data(), str.data() + str.size());
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* @endcode
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* @Returns An iterator pointing immediately after the last character produced.
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*/
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template <typename Rep, typename Period>
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iter_type put(iter_type s, std::ios_base& ios, char_type fill, duration<Rep, Period> const& d, const char_type* val = 0) const
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{
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if (std::has_facet<duration_units<CharT> >(ios.getloc()))
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{
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duration_units<CharT> const&facet = std::use_facet<duration_units<CharT> >(
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ios.getloc());
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std::basic_string<CharT> str = facet.get_pattern();
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return put(facet, s, ios, fill, d, str.data(), str.data() + str.size(), val);
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}
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else
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{
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duration_units_default<CharT> facet;
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std::basic_string<CharT> str = facet.get_pattern();
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return put(facet, s, ios, fill, d, str.data(), str.data() + str.size(), val);
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}
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}
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/**
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*
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* @param s an output stream iterator
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* @param ios a reference to a ios_base
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* @param fill the character used as filler
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* @param d the duration
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* @Effects As if s=std::use_facet<std::num_put<CharT, iter_type> >(ios.getloc()).put(s, ios, fill, static_cast<long int> (d.count())).
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* @Returns s, iterator pointing immediately after the last character produced.
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*/
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template <typename Rep, typename Period>
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iter_type put_value(iter_type s, std::ios_base& ios, char_type fill, duration<Rep, Period> const& d, const char_type* val = 0) const
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{
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if (val)
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{
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while (*val) {
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*s = *val;
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s++; val++;
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}
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return s;
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}
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return std::use_facet<std::num_put<CharT, iter_type> >(ios.getloc()).put(s, ios, fill,
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static_cast<typename detail::propagate<Rep>::type> (d.count()));
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}
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template <typename Rep, typename Period>
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iter_type put_value(iter_type s, std::ios_base& ios, char_type fill, duration<process_times<Rep>, Period> const& d, const char_type* = 0) const
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{
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*s++ = CharT('{');
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s = put_value(s, ios, fill, process_real_cpu_clock::duration(d.count().real));
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*s++ = CharT(';');
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s = put_value(s, ios, fill, process_user_cpu_clock::duration(d.count().user));
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*s++ = CharT(';');
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s = put_value(s, ios, fill, process_system_cpu_clock::duration(d.count().system));
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*s++ = CharT('}');
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return s;
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}
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/**
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*
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* @param s an output stream iterator
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* @param ios a reference to a ios_base
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* @param fill the character used as filler
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* @param d the duration
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* @Effects Let facet be the duration_units<CharT> facet associated to ios. If the associated unit is named,
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* as if
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* @code
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string_type str = facet.get_unit(get_duration_style(ios), d);
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s=std::copy(str.begin(), str.end(), s);
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* @endcode
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* Otherwise, format the unit as "[Period::num/Period::den]" followed by the unit associated to [N/D] obtained using facet.get_n_d_unit(get_duration_style(ios), d)
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* @Returns s, iterator pointing immediately after the last character produced.
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*/
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template <typename Rep, typename Period>
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iter_type put_unit(iter_type s, std::ios_base& ios, char_type fill, duration<Rep, Period> const& d) const
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{
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if (std::has_facet<duration_units<CharT> >(ios.getloc()))
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{
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duration_units<CharT> const&facet = std::use_facet<duration_units<CharT> >(
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ios.getloc());
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return put_unit(facet, s, ios, fill, d);
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}
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else
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{
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duration_units_default<CharT> facet;
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return put_unit(facet, s, ios, fill, d);
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}
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}
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template <typename Rep, typename Period>
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iter_type put_unit(duration_units<CharT> const& facet, iter_type s, std::ios_base& ios, char_type fill,
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duration<Rep, Period> const& d) const
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{
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if (facet.template is_named_unit<Period>()) {
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string_type str = facet.get_unit(get_duration_style(ios), d);
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s=std::copy(str.begin(), str.end(), s);
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} else {
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*s++ = CharT('[');
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std::use_facet<std::num_put<CharT, iter_type> >(ios.getloc()).put(s, ios, fill, Period::num);
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*s++ = CharT('/');
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std::use_facet<std::num_put<CharT, iter_type> >(ios.getloc()).put(s, ios, fill, Period::den);
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*s++ = CharT(']');
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string_type str = facet.get_n_d_unit(get_duration_style(ios), d);
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s=std::copy(str.begin(), str.end(), s);
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}
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return s;
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}
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template <typename Rep, typename Period>
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iter_type put_unit(duration_units<CharT> const& facet, iter_type s, std::ios_base& ios, char_type fill,
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duration<process_times<Rep>, Period> const& d) const
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{
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duration<Rep,Period> real(d.count().real);
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if (facet.template is_named_unit<Period>()) {
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string_type str = facet.get_unit(get_duration_style(ios), real);
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s=std::copy(str.begin(), str.end(), s);
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} else {
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*s++ = CharT('[');
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std::use_facet<std::num_put<CharT, iter_type> >(ios.getloc()).put(s, ios, fill, Period::num);
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*s++ = CharT('/');
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std::use_facet<std::num_put<CharT, iter_type> >(ios.getloc()).put(s, ios, fill, Period::den);
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*s++ = CharT(']');
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string_type str = facet.get_n_d_unit(get_duration_style(ios), real);
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s=std::copy(str.begin(), str.end(), s);
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}
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return s;
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}
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/**
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* Unique identifier for this type of facet.
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*/
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static std::locale::id id;
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/**
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* @Effects Destroy the facet
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*/
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~duration_put()
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{
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}
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};
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template <class CharT, class OutputIterator>
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std::locale::id duration_put<CharT, OutputIterator>::id;
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} // chrono
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} // boost
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#endif // header
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