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Internet Message Format  |  1996-08-05  |  3.8 KB
  1. Path: news.clark.net!not-for-mail
  2. From: gusty@clark.net (Harlan Messinger)
  3. Newsgroups: comp.lang.c++
  4. Subject: Re: Operator overload problem!
  5. Date: 19 Mar 1996 18:12:50 GMT
  6. Organization: Clark Internet Services, Inc., Ellicott City, MD USA
  7. Message-ID: <4imtf2$520@clarknet.clark.net>
  8. References: <DoIn1z.Gou@latcs1.lat.oz.au>
  9. NNTP-Posting-Host: explorer.clark.net
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  13. X-Newsreader: TIN [UNIX 1.3 950726BETA PL0]
  14.  
  15. I'm not sure what's causing your particular syntax error messages, but
  16. your << overload function promises to return an ostream& and then doesn't
  17. return anything.
  18.  
  19. Did you #include <iostream.h>? 
  20.  
  21. Gregary J Boyles (boylesgj@lion.cs.latrobe.edu.au) wrote:
  22. : I am trying to overload the << but I get the syntax errors : friends must be functions or
  23. : classes, 'ostream' cannot start a parameter declaration, 'Address::operator <<(int &,Address &)'
  24. : must be declared at the first set of astericks and declaration syntax error at the second set.
  25. : 
  26. : What the #$%& is it on about? I copied the operator overload function directly out of a program
  27. : which compiles and runs so why all of a sudden won't the bloody compiler accept it?
  28. : 
  29. : 
  30. : #include "defines.h"
  31. : 
  32. : class Address
  33. : {
  34. :      private : int Number;
  35. :            char *Street;
  36. :            char *City;
  37. :            int Zip;
  38. : 
  39. :      public : // Constructors
  40. :           Address(int ANumber,const char *AStreet,const char *ACity,int Zip);
  41. :           Address();
  42. :           // Copy constructor
  43. :           Address(Address& AnAddress);
  44. :           // Deconstructor
  45. :           ~Address();
  46. :           // Operator overloads
  47. : 
  48. :         **************************************************************************
  49. :         *                                             *
  50. :         * friend ostream& operator <<(ostream& OutPutStream,Address& AnAddress); *
  51. :         *                                             *
  52. :         **************************************************************************
  53. : 
  54. :           // Functions
  55. :           void Change(int ANumber,const char *AStreet,const char *ACity,int AZip);
  56. : };
  57. : 
  58. : #endif
  59. : 
  60. : 
  61. : 
  62. : 
  63. : 
  64. : 
  65. : 
  66. : // address.cpp
  67. : 
  68. : #include "address.h"
  69. : #include <string.h>
  70. : 
  71. : // Constructors
  72. : Address::Address(int ANumber,const char *AStreet,const char *ACity,int AZip)
  73. : {
  74. :      Number=ANumber;
  75. :      Street=new char[strlen(AStreet)+1];
  76. :      strcpy(Street,AStreet);
  77. :      City=new char[strlen(ACity)+1];
  78. :      strcpy(City,ACity);
  79. :      Zip=AZip;
  80. : }
  81. : 
  82. : Address::Address()
  83. : {
  84. :      Number=0;
  85. :      Street=new char[strlen("")+1];
  86. :      strcpy(Street,"");
  87. :      City=new char[strlen("")+1];
  88. :      strcpy(City,"");
  89. :      Zip=0;
  90. : }
  91. : 
  92. : // Copy constructor
  93. : Address::Address(Address& AnAddress)
  94. : {
  95. :      Number=AnAddress.Number;
  96. :      Street=new char[strlen(AnAddress.Street)+1];
  97. :      strcpy(Street,AnAddress.Street);
  98. :      City=new char[strlen(AnAddress.City)+1];
  99. :      strcpy(City,AnAddress.City);
  100. :      Zip=AnAddress.Zip;
  101. : }
  102. : 
  103. : // Deconstructor
  104. : Address::~Address()
  105. : {
  106. :      Number=0;
  107. :      strcpy(Street,"");
  108. :      strcpy(City,"");
  109. :      Zip=0;
  110. : }
  111. : 
  112. : // Operator overloads
  113. : 
  114. : ***************************************************************
  115. :                                   *
  116. : ostream& operator <<(ostream& OutPutStream,Address& AnAddress)*
  117. :                                   *
  118. : ***************************************************************
  119. : 
  120. : {
  121. :      OutPutStream<<"Street : "<<AnAddress.Number<<" "<<AnAddress.Street<<EOLN;
  122. :      OutPutStream<<"City : "<<AnAddress.City<<EOLN;
  123. :      OutPutStream<<"Zip code : "<<AnAddress.Zip<<EOLN;
  124. : }
  125. : 
  126. : // Functions
  127. : void Address::Change(int ANumber,const char *AStreet,const char *ACity,int AZip)
  128. : {
  129. :      Number=ANumber;
  130. :      delete Street;
  131. :      Street=new char[strlen(AStreet)+1];
  132. :      strcpy(Street,AStreet);
  133. :      delete City;
  134. :      City=new char[strlen(ACity)+1];
  135. :      strcpy(City,ACity);
  136. :      Zip=AZip;
  137. : }
  138. : 
  139.