comparison armadillo-2.4.4/include/armadillo_bits/format_wrap.hpp @ 0:8b6102e2a9b0

Armadillo Library

+// Copyright (C) 2008-2010 NICTA (www.nicta.com.au)
+// Copyright (C) 2008-2010 Conrad Sanderson
+// 
+// This file is part of the Armadillo C++ library.
+// It is provided without any warranty of fitness
+// for any purpose. You can redistribute this file
+// and/or modify it under the terms of the GNU
+// Lesser General Public License (LGPL) as published
+// by the Free Software Foundation, either version 3
+// of the License or (at your option) any later version.
+// (see http://www.opensource.org/licenses for more info)
+
+
+//! \addtogroup format_wrap
+//! @{
+
+
+//! \namespace arma_boost namespace for functions and classes which partially emulate Boost functionality 
+namespace arma_boost
+  {
+  
+  #if defined(ARMA_USE_BOOST_FORMAT)
+
+    using boost::format;
+    using boost::basic_format;
+    using boost::str;
+
+  #else
+  
+    #if defined(ARMA_HAVE_STD_SNPRINTF)
+
+      #define arma_snprintf std::snprintf
+
+    #else
+
+      // better-than-nothing emulation of C99 snprintf(),
+      // with correct return value and null-terminated output string.
+      // note that _snprintf() provided by MS is not a good substitute for snprintf()
+
+      inline
+      int
+      arma_snprintf(char* out, size_t size, const char* fmt, ...)
+        {
+        size_t i;
+        
+        for(i=0; i<size; ++i)
+          {
+          out[i] = fmt[i];
+          if(fmt[i] == char(0))
+            break;
+          }
+        
+        if(size > 0)
+          out[size-1] = char(0);
+        
+        return int(i);
+        }
+
+    #endif
+    
+    class format
+      {
+      public:
+    
+      format(const char* in_fmt)
+        : A(in_fmt)
+        {
+        }
+    
+      format(const std::string& in_fmt)
+        : A(in_fmt)
+        {
+        }
+    
+    
+      const std::string A;
+    
+      private:
+      format();
+      };
+    
+    
+    
+    template<typename T1, typename T2>
+    class basic_format
+      {
+      public:
+    
+      basic_format(const T1& in_A, const T2& in_B)
+        : A(in_A)
+        , B(in_B)
+        {
+        }
+    
+      const T1& A;
+      const T2& B;
+    
+      private:
+      basic_format();
+      };
+    
+    
+    
+    template<typename T2>
+    inline
+    basic_format< format, T2 >
+    operator% (const format& X, const T2& arg)
+      {
+      return basic_format< format, T2 >(X, arg);
+      }
+    
+    
+    
+    template<typename T1, typename T2, typename T3>
+    inline
+    basic_format< basic_format<T1,T2>, T3 >
+    operator% (const basic_format<T1,T2>& X, const T3& arg)
+      {
+      return basic_format< basic_format<T1,T2>, T3 >(X, arg);
+      }
+    
+    
+    
+    template<typename T2>
+    inline
+    std::string
+    str(const basic_format< format, T2>& X)
+      {
+      char  local_buffer[1024];
+      char* buffer = local_buffer;
+      
+      int buffer_size   = 1024;
+      int required_size = buffer_size;
+   
+      bool using_local_buffer = true;
+      
+      std::string out;
+      
+      do
+        {
+        if(using_local_buffer == false)
+          {
+          buffer = new char[buffer_size];
+          }
+        
+        required_size = arma_snprintf(buffer, size_t(buffer_size), X.A.A.c_str(), X.B);
+        
+        if(required_size < buffer_size)
+          {
+          if(required_size > 0)
+            {
+            out = buffer;
+            }
+          }
+        else
+          {
+          buffer_size *= 2;
+          }
+        
+        if(using_local_buffer == true)
+          {
+          using_local_buffer = false;
+          }
+        else
+          {
+          delete[] buffer;
+          }
+        
+        } while( (required_size >= buffer_size) );
+
+      return out;
+      }
+    
+    
+    
+    template<typename T2, typename T3>
+    inline
+    std::string
+    str(const basic_format< basic_format< format, T2>, T3>& X)
+      {
+      char  local_buffer[1024];
+      char* buffer = local_buffer;
+      
+      int buffer_size   = 1024;
+      int required_size = buffer_size;
+   
+      bool using_local_buffer = true;
+      
+      std::string out;
+      
+      do
+        {
+        if(using_local_buffer == false)
+          {
+          buffer = new char[buffer_size];
+          }
+        
+        required_size = arma_snprintf(buffer, size_t(buffer_size), X.A.A.A.c_str(), X.A.B, X.B);
+        
+        if(required_size < buffer_size)
+          {
+          if(required_size > 0)
+            {
+            out = buffer;
+            }
+          }
+        else
+          {
+          buffer_size *= 2;
+          }
+        
+        if(using_local_buffer == true)
+          {
+          using_local_buffer = false;
+          }
+        else
+          {
+          delete[] buffer;
+          }
+        
+        } while( (required_size >= buffer_size) );
+
+      return out;
+      }
+    
+    
+    
+    template<typename T2, typename T3, typename T4>
+    inline
+    std::string
+    str(const basic_format< basic_format< basic_format< format, T2>, T3>, T4>& X)
+      {
+      char  local_buffer[1024];
+      char* buffer = local_buffer;
+      
+      int buffer_size   = 1024;
+      int required_size = buffer_size;
+   
+      bool using_local_buffer = true;
+      
+      std::string out;
+      
+      do
+        {
+        if(using_local_buffer == false)
+          {
+          buffer = new char[buffer_size];
+          }
+        
+        required_size = arma_snprintf(buffer, size_t(buffer_size), X.A.A.A.A.c_str(), X.A.A.B, X.A.B, X.B);
+        
+        if(required_size < buffer_size)
+          {
+          if(required_size > 0)
+            {
+            out = buffer;
+            }
+          }
+        else
+          {
+          buffer_size *= 2;
+          }
+        
+        if(using_local_buffer == true)
+          {
+          using_local_buffer = false;
+          }
+        else
+          {
+          delete[] buffer;
+          }
+        
+        } while( (required_size >= buffer_size) );
+
+      return out;
+      }
+    
+    
+    
+    template<typename T2, typename T3, typename T4, typename T5>
+    inline
+    std::string
+    str(const basic_format< basic_format< basic_format< basic_format< format, T2>, T3>, T4>, T5>& X)
+      {
+      char  local_buffer[1024];
+      char* buffer = local_buffer;
+      
+      int buffer_size   = 1024;
+      int required_size = buffer_size;
+   
+      bool using_local_buffer = true;
+      
+      std::string out;
+      
+      do
+        {
+        if(using_local_buffer == false)
+          {
+          buffer = new char[buffer_size];
+          }
+        
+        required_size = arma_snprintf(buffer, size_t(buffer_size), X.A.A.A.A.A.c_str(), X.A.A.A.B, X.A.A.B, X.A.B, X.B);
+        
+        if(required_size < buffer_size)
+          {
+          if(required_size > 0)
+            {
+            out = buffer;
+            }
+          }
+        else
+          {
+          buffer_size *= 2;
+          }
+        
+        if(using_local_buffer == true)
+          {
+          using_local_buffer = false;
+          }
+        else
+          {
+          delete[] buffer;
+          }
+        
+        } while( (required_size >= buffer_size) );
+
+      return out;
+      }
+    
+    
+    
+    template<typename T2, typename T3, typename T4, typename T5, typename T6>
+    inline
+    std::string
+    str(const basic_format< basic_format< basic_format< basic_format< basic_format< format, T2>, T3>, T4>, T5>, T6>& X)
+      {
+      char  local_buffer[1024];
+      char* buffer = local_buffer;
+      
+      int buffer_size   = 1024;
+      int required_size = buffer_size;
+   
+      bool using_local_buffer = true;
+      
+      std::string out;
+      
+      do
+        {
+        if(using_local_buffer == false)
+          {
+          buffer = new char[buffer_size];
+          }
+        
+        required_size = arma_snprintf(buffer, size_t(buffer_size), X.A.A.A.A.A.A.c_str(), X.A.A.A.A.B, X.A.A.A.B, X.A.A.B, X.A.B, X.B);
+        
+        if(required_size < buffer_size)
+          {
+          if(required_size > 0)
+            {
+            out = buffer;
+            }
+          }
+        else
+          {
+          buffer_size *= 2;
+          }
+        
+        if(using_local_buffer == true)
+          {
+          using_local_buffer = false;
+          }
+        else
+          {
+          delete[] buffer;
+          }
+        
+        } while( (required_size >= buffer_size) );
+
+      return out;
+      }
+    
+    
+    
+    template<typename T2, typename T3, typename T4, typename T5, typename T6, typename T7>
+    inline
+    std::string
+    str(const basic_format< basic_format< basic_format< basic_format< basic_format< basic_format< format, T2>, T3>, T4>, T5>, T6>, T7>& X)
+      {
+      char  local_buffer[1024];
+      char* buffer = local_buffer;
+      
+      int buffer_size   = 1024;
+      int required_size = buffer_size;
+   
+      bool using_local_buffer = true;
+      
+      std::string out;
+      
+      do
+        {
+        if(using_local_buffer == false)
+          {
+          buffer = new char[buffer_size];
+          }
+        
+        required_size = arma_snprintf(buffer, size_t(buffer_size), X.A.A.A.A.A.A.A.c_str(), X.A.A.A.A.A.B, X.A.A.A.A.B, X.A.A.A.B, X.A.A.B, X.A.B, X.B);
+        
+        if(required_size < buffer_size)
+          {
+          if(required_size > 0)
+            {
+            out = buffer;
+            }
+          }
+        else
+          {
+          buffer_size *= 2;
+          }
+        
+        if(using_local_buffer == true)
+          {
+          using_local_buffer = false;
+          }
+        else
+          {
+          delete[] buffer;
+          }
+        
+        } while( (required_size >= buffer_size) );
+
+      return out;
+      }
+    
+    
+    
+    template<typename T1>
+    struct format_metaprog
+      {
+      static const uword depth = 0;
+    
+      inline
+      static  
+      const std::string&
+      get_fmt(const T1& X)
+        {
+        return X.A;
+        }
+      };
+    
+    
+    
+    //template<>
+    template<typename T1, typename T2>
+    struct format_metaprog< basic_format<T1,T2> >
+      {
+      static const uword depth = 1 + format_metaprog<T1>::depth;
+    
+      inline
+      static
+      const std::string&
+      get_fmt(const T1& X)
+        {
+        return format_metaprog<T1>::get_fmt(X.A);
+        }
+    
+      };
+    
+    
+    
+    template<typename T1, typename T2>
+    inline
+    std::string
+    str(const basic_format<T1,T2>& X)
+      {
+      return format_metaprog< basic_format<T1,T2> >::get_fmt(X.A);
+      }
+    
+    
+    
+    template<typename T1, typename T2>
+    inline
+    std::ostream&
+    operator<< (std::ostream& o, const basic_format<T1,T2>& X)
+      {
+      o << str(X);
+      return o;
+      }
+        
+        
+  #endif
+  
+  
+  template<typename T> struct string_only              { };
+  template<>           struct string_only<std::string> { typedef std::string result; };
+  
+  template<typename T> struct char_only                { };
+  template<>           struct char_only<char         > { typedef char        result; };
+
+  template<typename T>
+  struct basic_format_only { };
+  
+  #if defined(ARMA_USE_BOOST_FORMAT)
+    template<typename T>
+    struct basic_format_only< basic_format<T>      > { typedef basic_format<T>     result; };
+  #else
+    template<typename T1, typename T2>
+    struct basic_format_only< basic_format<T1, T2> > { typedef basic_format<T1,T2> result; };
+  #endif
+
+
+
+  template<typename T1>
+  inline
+  static
+  const T1&
+  str_wrapper(const T1& x, const typename string_only<T1>::result* junk = 0)
+    {
+    arma_ignore(junk);
+    
+    return x;
+    }
+  
+  
+  
+  template<typename T1>
+  inline
+  static
+  const T1*
+  str_wrapper(const T1* x, const typename char_only<T1>::result* junk = 0)
+    {
+    arma_ignore(junk);
+    
+    return x;
+    }
+  
+  
+  
+  template<typename T1>
+  inline
+  static
+  std::string
+  str_wrapper(const T1& x, const typename basic_format_only<T1>::result* junk = 0)
+    {
+    arma_ignore(junk);
+    
+    return str(x);
+    }
+  
+  }
+
+//! @}