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# FIX::DoubleConvertor Struct Reference

Converts double to/from a string. More...

`#include <FieldConvertors.h>`

List of all members.

## Static Public Member Functions

static std::string | convert (double value, int padding=0)
static bool | convert (const std::string &value, double &result)
static double | convert (const std::string &value) throw ( FieldConvertError )

## Detailed Description

Converts double to/from a string.

Definition at line 201 of file FieldConvertors.h.

## Member Function Documentation

static double FIX::DoubleConvertor::convert | ( | const std::string & | value | ) | throw ( FieldConvertError )`[inline, static]`

Definition at line 293 of file FieldConvertors.h.

References convert().

    00295   {
    00296     double result = 0.0;
    00297     if( !convert( value, result ) )
    00298       throw FieldConvertError();
    00299     else
    00300       return result;
    00301   }

static bool FIX::DoubleConvertor::convert | ( | const std::string & | value,
|  | double & | result |
| ) |  |  | `[inline, static]`

Definition at line 265 of file FieldConvertors.h.

    00266 {
    00267   const char * i = value.c_str();
    00268
    00269   // Catch null strings
    00270   if( !*i ) return false;
    00271   // Eat leading '-' and recheck for null string
    00272   if( *i == '-' && !*++i ) return false;
    00273
    00274   bool haveDigit = false;
    00275
    00276   if( isdigit(*i) )
    00277   {
    00278     haveDigit = true;
    00279     while( isdigit (*++i) );
    00280   }
    00281
    00282   if( *i == '.' && isdigit(*++i) )
    00283   {
    00284     haveDigit = true;
    00285     while( isdigit (*++i) );
    00286   }
    00287
    00288   if( *i || !haveDigit ) return false;
    00289     result = strtod( value.c_str(), 0 );
    00290     return true;
    00291   }

static std::string FIX::DoubleConvertor::convert | ( | double | value,
|  | int | padding = `0` |
| ) |  |  | `[inline, static]`

Definition at line 203 of file FieldConvertors.h.

References STRING_SPRINTF.

Referenced by FIX::DataDictionary::checkValidFormat(), convert(), FIX::Dictionary::getDouble(), and FIX::Dictionary::setDouble().

    00204   {
    00205     char result[32];
    00206     char *end = 0;
    00207
    00208     int size;
    00209     if( value == 0 || value > 0.0001 || value <= -0.0001 )
    00210     {
    00211       size = STRING_SPRINTF( result, "%.15g", value );
    00212
    00213       if( padding > 0 )
    00214       {
    00215         char* point = result;
    00216         end = result + size - 1;
    00217         while( *point != '.' && *point != 0 )
    00218           point++;
    00219
    00220         if( *point == 0 )
    00221         {
    00222           end = point;
    00223           *point = '.';
    00224           size++;
    00225         }
    00226         int needed = padding - (int)(end - point);
    00227
    00228         while( needed-- > 0 )
    00229         {
    00230           *(++end) = '0';
    00231           size++;
    00232         }
    00233         *(end+1) = 0;
    00234       }
    00235     }
    00236     else
    00237     {
    00238       size = STRING_SPRINTF( result, "%.15f", value );
    00239       // strip trailing 0's
    00240       end = result + size - 1;
    00241
    00242       if( padding > 0 )
    00243       {
    00244         int discard = 15 - padding;
    00245
    00246         while( (*end == '0') && (discard-- > 0) )
    00247         {
    00248           *(end--) = 0;
    00249           size--;
    00250         }
    00251      }
    00252      else
    00253      {
    00254        while( *end == '0' )
    00255        {
    00256          *(end--) = 0;
    00257          size--;
    00258        }
    00259      }
    00260    }
    00261
    00262    return std::string( result, size );
    00263 }

The documentation for this struct was generated from the following file:

- /home/omiller/Development/autobuild/quickfix/src/C++/FieldConvertors.h