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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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TAU_TYPE_STRING(3)					      TAU Instrumentation API						TAU_TYPE_STRING(3)

NAME
TAU_TYPE_STRING - Creates a type string SYNOPSIS
C++: TAU_TYPE_STRING(string &variable, string &type_string); DESCRIPTION
This macro assigns the string constructed in type_string to the variable. The + operator and the CT macro can be used to construct the type string of an object. This is useful in identifying templates uniquely, as shown below. EXAMPLE
C++ : template<class PLayout> ostream& operator<<(ostream& out, const ParticleBase<PLayout>& P) { TAU_TYPE_STRING(taustr, "ostream (ostream, " + CT(P) + " )"); TAU_PROFILE("operator<<()"taustr, TAU_PARTICLE | TAU_IO); ... } When PLayout is instantiated with " UniformCartesian<3U, double> ",this generates the unique template name: operator<<() ostream const ParticleBase<UniformCartesian<3U, double> > ) The following example illustrates the usage of the CT macro to extract the name of the class associated with the given object using CT(*this); template<class PLayout> unsigned ParticleBase<PLayout7>::GetMessage(Message& msg, int node) { TAU_TYPE_STRING(taustr, CT(*this) + "unsigned (Message, int)"); TAU_PROFILE("ParticleBase::GetMessage()", taustr, TAU_PARTICLE); ... } When PLayout is instantiated with " UniformCartesian<3U, double> ",this generates the unique template name: ParticleBase::GetMessage() ParticleBase<UniformCartesian<3U, double> > unsigned (Message, int) SEE ALSO
CT(3), TAU_PROFILE, TAU_PROFILE_TIMER(3) 08/31/2005 TAU_TYPE_STRING(3)
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