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Operator

C++ std::stringstream operator<< overloadingstd::wstring VS std::stringWhy is “using namespace std” considered bad practice?What is the “-->” operator in C++?What are the basic rules and idioms for operator overloading?TCLAP issus with parsing std::wstringstd::ostringstream isn't returning a valid stringtemplate argument deduction/substitution failed, when using std::function and std::bindTemplate class generate errors in C++no match for 'operator='(operand type are 'std::vector<int>' and 'int'Why is const required for 'operator>' but not for 'operator<'?

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0

This question already has an answer here:

• 
  C++ std::stringstream operator<< overloading
  
  1 answer
  
  

Here's my toy program. It fails to compile with error message " no operator << matches these operands". Any help will be appreciated.

struct foo 
 std::string name;
;

std::ostringstream& operator<<(std::ostringstream& os, const foo& info)

 os << info.name;
 return os;


void insert(const foo& info)

 std::ostringstream os;
 os << "Inserted here " << info; // don't work here


int main()

 foo f1;
 f1.name = "Hello";
 insert(f1);

c++

share|improve this question

asked Mar 23 at 4:47

ark1974ark1974

1839

marked as duplicate by Azeem, Ben Voigt c++
Users with the  c++ badge can single-handedly close c++ questions as duplicates and reopen them as needed.

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Mar 23 at 5:28

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

add a comment | 

0

This question already has an answer here:

• 
  C++ std::stringstream operator<< overloading
  
  1 answer
  
  

Here's my toy program. It fails to compile with error message " no operator << matches these operands". Any help will be appreciated.

struct foo 
 std::string name;
;

std::ostringstream& operator<<(std::ostringstream& os, const foo& info)

 os << info.name;
 return os;


void insert(const foo& info)

 std::ostringstream os;
 os << "Inserted here " << info; // don't work here


int main()

 foo f1;
 f1.name = "Hello";
 insert(f1);

c++

share|improve this question

asked Mar 23 at 4:47

ark1974ark1974

1839

marked as duplicate by Azeem, Ben Voigt c++
Users with the  c++ badge can single-handedly close c++ questions as duplicates and reopen them as needed.

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Mar 23 at 5:28

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

add a comment | 

This question already has an answer here:

• 
  C++ std::stringstream operator<< overloading
  
  1 answer
  
  

Here's my toy program. It fails to compile with error message " no operator << matches these operands". Any help will be appreciated.

struct foo 
 std::string name;
;

std::ostringstream& operator<<(std::ostringstream& os, const foo& info)

 os << info.name;
 return os;


void insert(const foo& info)

 std::ostringstream os;
 os << "Inserted here " << info; // don't work here


int main()

 foo f1;
 f1.name = "Hello";
 insert(f1);

c++

share|improve this question

asked Mar 23 at 4:47

ark1974ark1974

1839

struct foo 
 std::string name;
;

std::ostringstream& operator<<(std::ostringstream& os, const foo& info)

 os << info.name;
 return os;


void insert(const foo& info)

 std::ostringstream os;
 os << "Inserted here " << info; // don't work here


int main()

 foo f1;
 f1.name = "Hello";
 insert(f1);

share|improve this question

asked Mar 23 at 4:47

ark1974ark1974

1839

share|improve this question

asked Mar 23 at 4:47

ark1974ark1974

1839

asked Mar 23 at 4:47

ark1974ark1974

1839

asked Mar 23 at 4:47

ark1974ark1974

1839

1 Answer
1

active

oldest

votes

4

The reason

os << "Inserted here " << info;

does not work is

os << "Inserted here "

returns a std::ostream&, not a std::ostringstream&.

Options:

1. 
   

   Change your function to be use std::ostream instead of std::ostringstream.

   
   
   

   std::ostream& operator<<(std::ostream& os, const foo& info) ... 
   

   
   


2. 
   

   Change how you use it. Use

   
   
   

   os << "Inserted here ";
   os << info;
   

   
   

I strongly recommend using the first option.

share|improve this answer

edited Mar 23 at 5:00

answered Mar 23 at 4:57

R SahuR Sahu

172k1298198

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  In # 1, std::stream& os -> std::ostream& os.
  
  – Azeem
  Mar 23 at 5:00
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @Azeem, thanks for the sharp eyes :)
  
  – R Sahu
  Mar 23 at 5:00
  

  
  
  
  

add a comment | 

4

The reason

os << "Inserted here " << info;

does not work is

os << "Inserted here "

returns a std::ostream&, not a std::ostringstream&.

Options:

1. 
   

   Change your function to be use std::ostream instead of std::ostringstream.

   
   
   

   std::ostream& operator<<(std::ostream& os, const foo& info) ... 
   

   
   


2. 
   

   Change how you use it. Use

   
   
   

   os << "Inserted here ";
   os << info;
   

   
   

I strongly recommend using the first option.

share|improve this answer

edited Mar 23 at 5:00

answered Mar 23 at 4:57

R SahuR Sahu

172k1298198

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  In # 1, std::stream& os -> std::ostream& os.
  
  – Azeem
  Mar 23 at 5:00
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @Azeem, thanks for the sharp eyes :)
  
  – R Sahu
  Mar 23 at 5:00
  

  
  
  
  

add a comment | 

4

The reason

os << "Inserted here " << info;

does not work is

os << "Inserted here "

returns a std::ostream&, not a std::ostringstream&.

Options:

1. 
   

   Change your function to be use std::ostream instead of std::ostringstream.

   
   
   

   std::ostream& operator<<(std::ostream& os, const foo& info) ... 
   

   
   


2. 
   

   Change how you use it. Use

   
   
   

   os << "Inserted here ";
   os << info;
   

   
   

I strongly recommend using the first option.

share|improve this answer

edited Mar 23 at 5:00

answered Mar 23 at 4:57

R SahuR Sahu

172k1298198

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  In # 1, std::stream& os -> std::ostream& os.
  
  – Azeem
  Mar 23 at 5:00
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @Azeem, thanks for the sharp eyes :)
  
  – R Sahu
  Mar 23 at 5:00
  

  
  
  
  

add a comment | 

The reason

os << "Inserted here " << info;

does not work is

os << "Inserted here "

returns a std::ostream&, not a std::ostringstream&.

Options:

1. 
   

   Change your function to be use std::ostream instead of std::ostringstream.

   
   
   

   std::ostream& operator<<(std::ostream& os, const foo& info) ... 
   

   
   


2. 
   

   Change how you use it. Use

   
   
   

   os << "Inserted here ";
   os << info;
   

   
   

I strongly recommend using the first option.

share|improve this answer

edited Mar 23 at 5:00

answered Mar 23 at 4:57

R SahuR Sahu

172k1298198

os << "Inserted here " << info;

os << "Inserted here "

share|improve this answer

edited Mar 23 at 5:00

answered Mar 23 at 4:57

R SahuR Sahu

172k1298198

answered Mar 23 at 4:57

R SahuR Sahu

172k1298198

answered Mar 23 at 4:57

R SahuR Sahu

172k1298198