boost/convert/base.hpp
// Copyright (c) 2009-2014 Vladimir Batov. // Use, modification and distribution are subject to the Boost Software License, // Version 1.0. See http://www.boost.org/LICENSE_1_0.txt. #ifndef BOOST_CONVERT_CONVERTER_BASE_HPP #define BOOST_CONVERT_CONVERTER_BASE_HPP #include <boost/convert/parameters.hpp> #include <boost/convert/detail/is_string.hpp> #include <cctype> #include <cstring> namespace boost { namespace cnv { namespace ARG = boost::cnv::parameter; template<typename> struct cnvbase; }} #define BOOST_CNV_TO_STRING \ template<typename string_type> \ typename boost::enable_if<cnv::is_string<string_type>, void>::type \ operator() #define BOOST_CNV_STRING_TO \ template<typename string_type> \ typename boost::enable_if<cnv::is_string<string_type>, void>::type \ operator() #define BOOST_CNV_PARAM(param_name, param_type) \ derived_type& operator()(boost::parameter::aux::tag<ARG::type::param_name, param_type>::type const& arg) template<typename derived_type> struct boost::cnv::cnvbase { typedef cnvbase this_type; typedef int int_type; typedef unsigned int uint_type; typedef long int lint_type; typedef unsigned long int ulint_type; typedef short int sint_type; typedef unsigned short int usint_type; typedef long long int llint_type; typedef unsigned long long int ullint_type; typedef float flt_type; typedef double dbl_type; typedef long double ldbl_type; // Integration of user-types via operator>>() template<typename type_in, typename type_out> void operator()(type_in const& in, boost::optional<type_out>& out) const { in >> out; } // Basic type to string BOOST_CNV_TO_STRING ( int_type v, optional<string_type>& r) const { to_str_(v, r); } BOOST_CNV_TO_STRING ( uint_type v, optional<string_type>& r) const { to_str_(v, r); } BOOST_CNV_TO_STRING ( lint_type v, optional<string_type>& r) const { to_str_(v, r); } BOOST_CNV_TO_STRING ( llint_type v, optional<string_type>& r) const { to_str_(v, r); } BOOST_CNV_TO_STRING ( ulint_type v, optional<string_type>& r) const { to_str_(v, r); } BOOST_CNV_TO_STRING (ullint_type v, optional<string_type>& r) const { to_str_(v, r); } BOOST_CNV_TO_STRING ( sint_type v, optional<string_type>& r) const { to_str_(v, r); } BOOST_CNV_TO_STRING ( usint_type v, optional<string_type>& r) const { to_str_(v, r); } BOOST_CNV_TO_STRING ( flt_type v, optional<string_type>& r) const { to_str_(v, r); } BOOST_CNV_TO_STRING ( dbl_type v, optional<string_type>& r) const { to_str_(v, r); } BOOST_CNV_TO_STRING ( ldbl_type v, optional<string_type>& r) const { to_str_(v, r); } // String to basic type BOOST_CNV_STRING_TO (string_type const& s, optional< int_type>& r) const { str_to_(s, r); } BOOST_CNV_STRING_TO (string_type const& s, optional< uint_type>& r) const { str_to_(s, r); } BOOST_CNV_STRING_TO (string_type const& s, optional< lint_type>& r) const { str_to_(s, r); } BOOST_CNV_STRING_TO (string_type const& s, optional< llint_type>& r) const { str_to_(s, r); } BOOST_CNV_STRING_TO (string_type const& s, optional< ulint_type>& r) const { str_to_(s, r); } BOOST_CNV_STRING_TO (string_type const& s, optional<ullint_type>& r) const { str_to_(s, r); } BOOST_CNV_STRING_TO (string_type const& s, optional< sint_type>& r) const { str_to_(s, r); } BOOST_CNV_STRING_TO (string_type const& s, optional< usint_type>& r) const { str_to_(s, r); } BOOST_CNV_STRING_TO (string_type const& s, optional< flt_type>& r) const { str_to_(s, r); } BOOST_CNV_STRING_TO (string_type const& s, optional< dbl_type>& r) const { str_to_(s, r); } BOOST_CNV_STRING_TO (string_type const& s, optional< ldbl_type>& r) const { str_to_(s, r); } // Formatters // BOOST_CNV_PARAM (locale, std::locale const) { locale_ = arg[ARG:: locale]; return dncast(); } BOOST_CNV_PARAM (base, base::type const) { base_ = arg[ARG:: base]; return dncast(); } BOOST_CNV_PARAM (adjust, adjust::type const) { adjust_ = arg[ARG:: adjust]; return dncast(); } BOOST_CNV_PARAM (precision, int const) { precision_ = arg[ARG::precision]; return dncast(); } BOOST_CNV_PARAM (precision, int) { precision_ = arg[ARG::precision]; return dncast(); } BOOST_CNV_PARAM (uppercase, bool const) { uppercase_ = arg[ARG::uppercase]; return dncast(); } BOOST_CNV_PARAM (skipws, bool const) { skipws_ = arg[ARG:: skipws]; return dncast(); } BOOST_CNV_PARAM (width, int const) { width_ = arg[ARG:: width]; return dncast(); } BOOST_CNV_PARAM (fill, char const) { fill_ = arg[ARG:: fill]; return dncast(); } protected: cnvbase() : base_ (10), skipws_ (false), precision_ (0), uppercase_ (false), width_ (0), fill_ (' '), adjust_ (boost::cnv::adjust::right) {} template<typename string_type, typename out_type> void str_to_(string_type const& str, optional<out_type>& result_out) const { cnv::range<string_type const> range (str); if (skipws_) for (; !range.empty() && std::isspace(*range.begin()); ++range); if (range.empty()) return; if (std::isspace(*range.begin())) return; dncast().str_to(range, result_out); } template<typename in_type, typename string_type> void to_str_(in_type value_in, optional<string_type>& result_out) const { typedef typename cnv::range<string_type>::value_type char_type; char_type buf[bufsize_]; cnv::range<char_type*> range = dncast().to_str(value_in, buf); char_type* beg = range.begin(); char_type* end = range.end(); if (beg < end) { format_(buf, beg, end); result_out = string_type(beg, end); } } template<typename char_type> void format_(char_type* buf, char_type*& beg, char_type*& end) const { if (uppercase_) { for (char_type* p = beg; p < end; ++p) *p = std::toupper(*p); } if (width_) { int const num_fillers = (std::max)(0, int(width_ - (end - beg))); int const num_left = adjust_ == boost::cnv::adjust::left ? 0 : adjust_ == boost::cnv::adjust::right ? num_fillers : (num_fillers / 2); int const num_right = num_fillers - num_left; int const str_size = end - beg; bool const move = (beg < buf + num_left) // No room for left fillers || (buf + bufsize_ < end + num_right); // No room for right fillers if (move) { std::memmove(buf + num_left, beg, str_size * sizeof(char_type)); beg = buf + num_left; end = beg + str_size; } for (int k = 0; k < num_left; *(--beg) = fill_, ++k); for (int k = 0; k < num_right; *(end++) = fill_, ++k); } } derived_type const& dncast () const { return *static_cast<derived_type const*>(this); } derived_type& dncast () { return *static_cast<derived_type*>(this); } // ULONG_MAX(8 bytes) = 18446744073709551615 (20(10) or 32(2) characters) // double (8 bytes) max is 316 chars static int const bufsize_ = 1024; int base_; bool skipws_; int precision_; bool uppercase_; int width_; int fill_; adjust::type adjust_; // std::locale locale_; }; #undef BOOST_CNV_TO_STRING #undef BOOST_CNV_STRING_TO #undef BOOST_CNV_PARAM #endif // BOOST_CONVERT_CONVERTER_BASE_HPP