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+// ----------------------------------------------------------------------------
+// format_implementation.hpp  Implementation of the basic_format class
+// ----------------------------------------------------------------------------
+
+//  Copyright Samuel Krempp 2003. 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)
+
+//  See http://www.boost.org/libs/format for library home page
+
+
+// ----------------------------------------------------------------------------
+
+#ifndef BOOST_FORMAT_IMPLEMENTATION_HPP
+#define BOOST_FORMAT_IMPLEMENTATION_HPP
+
+#include <boost/config.hpp>
+#include <boost/throw_exception.hpp>
+#include <boost/assert.hpp>
+#include <boost/format/format_class.hpp>
+#include <algorithm> // std::swap
+
+namespace boost {
+
+// ---  basic_format implementation -----------------------------------------//
+
+    template< class Ch, class Tr, class Alloc>
+    basic_format<Ch, Tr, Alloc>:: basic_format(const Ch* s)
+        : style_(0), cur_arg_(0), num_args_(0), dumped_(false),
+          exceptions_(io::all_error_bits)
+    {
+        if( s)
+            parse( s );
+    }
+
+#if !defined(BOOST_NO_STD_LOCALE)
+    template< class Ch, class Tr, class Alloc>
+    basic_format<Ch, Tr, Alloc>:: basic_format(const Ch* s, const std::locale & loc)
+        : style_(0), cur_arg_(0), num_args_(0), dumped_(false),
+          exceptions_(io::all_error_bits), loc_(loc)
+    {
+        if(s) parse( s );
+    }
+
+    template< class Ch, class Tr, class Alloc>
+    basic_format<Ch, Tr, Alloc>:: basic_format(const string_type& s, const std::locale & loc)
+        : style_(0), cur_arg_(0), num_args_(0), dumped_(false),
+          exceptions_(io::all_error_bits), loc_(loc)
+    {
+        parse(s);  
+    }
+#endif // ! BOOST_NO_STD_LOCALE
+    template< class Ch, class Tr, class Alloc>
+    io::detail::locale_t basic_format<Ch, Tr, Alloc>:: 
+    getloc() const {
+        return loc_ ? loc_.get() : io::detail::locale_t(); 
+    }
+
+    template< class Ch, class Tr, class Alloc>
+    basic_format<Ch, Tr, Alloc>:: basic_format(const string_type& s)
+        : style_(0), cur_arg_(0), num_args_(0), dumped_(false),
+          exceptions_(io::all_error_bits)
+    {
+        parse(s);  
+    }
+
+    template< class Ch, class Tr, class Alloc> // just don't copy the buf_ member
+    basic_format<Ch, Tr, Alloc>:: basic_format(const basic_format& x)
+        : items_(x.items_), bound_(x.bound_), style_(x.style_),
+          cur_arg_(x.cur_arg_), num_args_(x.num_args_), dumped_(x.dumped_),
+          prefix_(x.prefix_), exceptions_(x.exceptions_), loc_(x.loc_)
+    {
+    }
+
+    template< class Ch, class Tr, class Alloc>  // just don't copy the buf_ member
+    basic_format<Ch, Tr, Alloc>& basic_format<Ch, Tr, Alloc>:: 
+    operator= (const basic_format& x) {
+        if(this == &x)
+            return *this;
+        (basic_format<Ch, Tr, Alloc>(x)).swap(*this);
+        return *this;
+    }
+    template< class Ch, class Tr, class Alloc>
+    void  basic_format<Ch, Tr, Alloc>:: 
+    swap (basic_format & x) {
+        std::swap(exceptions_, x.exceptions_);
+        std::swap(style_, x.style_); 
+        std::swap(cur_arg_, x.cur_arg_); 
+        std::swap(num_args_, x.num_args_);
+        std::swap(dumped_, x.dumped_);
+
+        items_.swap(x.items_);
+        prefix_.swap(x.prefix_);
+        bound_.swap(x.bound_);
+    }
+
+    template< class Ch, class Tr, class Alloc>
+    unsigned char basic_format<Ch,Tr, Alloc>:: exceptions() const {
+        return exceptions_; 
+    }
+
+    template< class Ch, class Tr, class Alloc>
+    unsigned char basic_format<Ch,Tr, Alloc>:: exceptions(unsigned char newexcept) { 
+        unsigned char swp = exceptions_; 
+        exceptions_ = newexcept; 
+        return swp; 
+    }
+
+    template<class Ch, class Tr, class Alloc>
+    void basic_format<Ch, Tr, Alloc>:: 
+    make_or_reuse_data (std::size_t nbitems) {
+#if !defined(BOOST_NO_STD_LOCALE)
+        Ch fill = ( BOOST_USE_FACET(std::ctype<Ch>, getloc()) ). widen(' ');
+#else
+        Ch fill = ' ';
+#endif
+        if(items_.size() == 0)
+            items_.assign( nbitems, format_item_t(fill) );
+        else {
+            if(nbitems>items_.size())
+                items_.resize(nbitems, format_item_t(fill));
+            bound_.resize(0);
+            for(std::size_t i=0; i < nbitems; ++i)
+                items_[i].reset(fill); //  strings are resized, instead of reallocated
+        }
+        prefix_.resize(0);
+    }
+
+    template< class Ch, class Tr, class Alloc>
+    basic_format<Ch,Tr, Alloc>& basic_format<Ch,Tr, Alloc>:: 
+    clear () {
+        // empty the string buffers (except bound arguments)
+        // and make the format object ready for formatting a new set of arguments
+
+        BOOST_ASSERT( bound_.size()==0 || num_args_ == static_cast<int>(bound_.size()) );
+
+        for(unsigned long i=0; i<items_.size(); ++i) {
+            // clear converted strings only if the corresponding argument is not  bound :
+            if( bound_.size()==0 || items_[i].argN_<0 || !bound_[ items_[i].argN_ ] )
+                items_[i].res_.resize(0);
+        }
+        cur_arg_=0; dumped_=false;
+        // maybe first arg is bound:
+        if(bound_.size() != 0) {
+            for(; cur_arg_ < num_args_ && bound_[cur_arg_]; ++cur_arg_)
+                {}
+        }
+        return *this;
+    }
+
+    template< class Ch, class Tr, class Alloc>
+    basic_format<Ch,Tr, Alloc>& basic_format<Ch,Tr, Alloc>:: 
+    clear_binds () {
+        // remove all binds, then clear()
+        bound_.resize(0);
+        clear();
+        return *this;
+    }
+
+    template< class Ch, class Tr, class Alloc>
+    basic_format<Ch,Tr, Alloc>& basic_format<Ch,Tr, Alloc>:: 
+    clear_bind (int argN) {
+        // remove the bind of ONE argument then clear()
+        if(argN<1 || argN > num_args_ || bound_.size()==0 || !bound_[argN-1] ) {
+            if( exceptions() & io::out_of_range_bit)
+                boost::throw_exception(io::out_of_range(argN, 1, num_args_+1 ) ); 
+            else return *this;
+        }
+        bound_[argN-1]=false;
+        clear();
+        return *this;
+    }
+
+    template< class Ch, class Tr, class Alloc>
+    int basic_format<Ch,Tr, Alloc>::
+    bound_args() const {
+        if(bound_.size()==0)
+            return 0;
+        int n=0;
+        for(int i=0; i<num_args_ ; ++i)
+            if(bound_[i])
+                ++n;
+        return n;
+    }
+
+    template< class Ch, class Tr, class Alloc>
+    int basic_format<Ch,Tr, Alloc>::
+    fed_args() const {
+        if(bound_.size()==0)
+            return cur_arg_;
+        int n=0;
+        for(int i=0; i<cur_arg_ ; ++i)
+            if(!bound_[i])
+                ++n;
+        return n;
+    }
+
+    template< class Ch, class Tr, class Alloc>
+    int basic_format<Ch,Tr, Alloc>::
+    cur_arg() const {
+      return cur_arg_+1; }
+
+    template< class Ch, class Tr, class Alloc>
+    int basic_format<Ch,Tr, Alloc>::
+    remaining_args() const {
+        if(bound_.size()==0)
+            return num_args_-cur_arg_;
+        int n=0;
+        for(int i=cur_arg_; i<num_args_ ; ++i)
+            if(!bound_[i])
+                ++n;
+        return n;
+    }
+
+    template< class Ch, class Tr, class Alloc>
+    typename basic_format<Ch, Tr, Alloc>::string_type 
+    basic_format<Ch,Tr, Alloc>:: 
+    str () const {
+        if(items_.size()==0)
+            return prefix_;
+        if( cur_arg_ < num_args_)
+            if( exceptions() & io::too_few_args_bit )
+                // not enough variables supplied
+                boost::throw_exception(io::too_few_args(cur_arg_, num_args_)); 
+
+        unsigned long i;
+        string_type res;
+        res.reserve(size());
+        res += prefix_;
+        for(i=0; i < items_.size(); ++i) {
+            const format_item_t& item = items_[i];
+            res += item.res_;
+            if( item.argN_ == format_item_t::argN_tabulation) { 
+                BOOST_ASSERT( item.pad_scheme_ & format_item_t::tabulation);
+                if( static_cast<size_type>(item.fmtstate_.width_) > res.size() )
+                    res.append( static_cast<size_type>(item.fmtstate_.width_) - res.size(),
+                                        item.fmtstate_.fill_ );
+            }
+            res += item.appendix_;
+        }
+        dumped_=true;
+        return res;
+    }
+    template< class Ch, class Tr, class Alloc>
+    typename std::basic_string<Ch, Tr, Alloc>::size_type  basic_format<Ch,Tr, Alloc>:: 
+    size () const {
+#ifdef BOOST_MSVC
+       // If std::min<unsigned> or std::max<unsigned> are already instantiated
+       // at this point then we get a blizzard of warning messages when we call
+       // those templates with std::size_t as arguments.  Weird and very annoyning...
+#pragma warning(push)
+#pragma warning(disable:4267)
+#endif
+        BOOST_USING_STD_MAX();
+        size_type sz = prefix_.size();
+        unsigned long i;
+        for(i=0; i < items_.size(); ++i) {
+            const format_item_t& item = items_[i];
+            sz += item.res_.size();
+            if( item.argN_ == format_item_t::argN_tabulation)
+                sz = max BOOST_PREVENT_MACRO_SUBSTITUTION (sz,
+                                        static_cast<size_type>(item.fmtstate_.width_) );
+            sz += item.appendix_.size();
+        }
+        return sz;
+#ifdef BOOST_MSVC
+#pragma warning(pop)
+#endif
+    }
+
+namespace io {
+namespace detail {
+
+    template<class Ch, class Tr, class Alloc, class T> 
+    basic_format<Ch, Tr, Alloc>&  
+    bind_arg_body (basic_format<Ch, Tr, Alloc>& self, int argN, const T& val) {
+        // bind one argument to a fixed value
+        // this is persistent over clear() calls, thus also over str() and <<
+        if(self.dumped_) 
+            self.clear(); // needed because we will modify cur_arg_
+        if(argN<1 || argN > self.num_args_) {
+            if( self.exceptions() & io::out_of_range_bit )
+                boost::throw_exception(io::out_of_range(argN, 1, self.num_args_+1 ) );
+            else return self;
+        }
+        if(self.bound_.size()==0) 
+            self.bound_.assign(self.num_args_,false);
+        else 
+            BOOST_ASSERT( self.num_args_ == static_cast<signed int>(self.bound_.size()) );
+        int o_cur_arg = self.cur_arg_;
+        self.cur_arg_ = argN-1; // arrays begin at 0
+
+        self.bound_[self.cur_arg_]=false; // if already set, we unset and re-sets..
+        self.operator%(val); // put val at the right place, because cur_arg is set
+    
+
+        // Now re-position cur_arg before leaving :
+        self.cur_arg_ = o_cur_arg; 
+        self.bound_[argN-1]=true;
+        if(self.cur_arg_ == argN-1 ) {
+            // hum, now this arg is bound, so move to next free arg
+            while(self.cur_arg_ < self.num_args_ && self.bound_[self.cur_arg_])   
+                ++self.cur_arg_;
+        }
+        // In any case, we either have all args, or are on an unbound arg :
+        BOOST_ASSERT( self.cur_arg_ >= self.num_args_ || ! self.bound_[self.cur_arg_]);
+        return self;
+    }
+
+    template<class Ch, class Tr, class Alloc, class T> basic_format<Ch, Tr, Alloc>&
+    modify_item_body (basic_format<Ch, Tr, Alloc>& self, int itemN, T manipulator) {
+        // applies a manipulator to the format_item describing a given directive.
+        // this is a permanent change, clear or reset won't cancel that.
+        if(itemN<1 || itemN > static_cast<signed int>(self.items_.size() )) {
+            if( self.exceptions() & io::out_of_range_bit ) 
+                boost::throw_exception(io::out_of_range(itemN, 1, static_cast<int>(self.items_.size()) ));
+            else return self;
+        }
+        self.items_[itemN-1].fmtstate_. template apply_manip<T> ( manipulator );
+        return self;
+    }
+
+} // namespace detail
+} // namespace io
+} // namespace boost
+
+
+
+#endif  // BOOST_FORMAT_IMPLEMENTATION_HPP