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Top Forums Programming C++ operator overloading error Post 303026988 by milhan on Thursday 6th of December 2018 02:10:16 PM
Old 12-06-2018
C++ operator overloading error

hi,
I defined my own String class and overloaded the output operator with
Code:
friend ostream& operator<<(ostream& os, const myString& str);
//overloads the << operator so it can be used to output values of type myString

which works fine. Until I try to execute the following statement:
Code:
// + concatenation operator is already defined for myString
cout << (str4=str2+str) << endl; //This statement concatenates str to str2, then assigns it to str4 and returns str4, right?

And, I get error
Code:
error: no match for ‘operator<<' (operand types are ‘std::ostream' {aka ‘std::basic_ostream<char>'} and ‘void')
  cout << (str4=str2+str) << endl;
  ~~~~~^~~~~~~~~~~~~~~~~~

The above code works fine when I change the concatenation statement as follows:
Code:
str4=str2+str;
cout << str4 << endl;

What did I miss?
 

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DROP OPERATOR 
CLASS(7) SQL Commands DROP OPERATOR CLASS(7) NAME
DROP OPERATOR CLASS - remove a user-defined operator class SYNOPSIS
DROP OPERATOR CLASS name USING access_method [ CASCADE | RESTRICT ] INPUTS name The name (optionally schema-qualified) of an existing operator class. access_method The name of the index access method the operator class is for. CASCADE Automatically drop objects that depend on the operator class. RESTRICT Refuse to drop the operator class if there are any dependent objects. This is the default. OUTPUTS DROP OPERATOR CLASS The message returned if the command is successful. DESCRIPTION
DROP OPERATOR CLASS drops an existing operator class from the database. To execute this command you must be the owner of the operator class. NOTES The DROP OPERATOR CLASS statement is a PostgreSQL language extension. Refer to CREATE OPERATOR CLASS [create_operator_class(7)] for information on how to create operator classes. USAGE
Remove B-tree operator class widget_ops: DROP OPERATOR CLASS widget_ops USING btree; This command will not execute if there are any existing indexes that use the operator class. Add CASCADE to drop such indexes along with the operator class. COMPATIBILITY
SQL92 There is no DROP OPERATOR CLASS in SQL92. SQL - Language Statements 2002-11-22 DROP OPERATOR CLASS(7)
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