How to make std::cout print nothing

[proper spire]

  #ifndef NDEBUG
      void LOG_INFO(std::ostream& output) {
          output << "\n";
      }
  #else
      void LOG_INFO(std::ostream& output) {
          output << "";
      }
  #endif

Trying to implement a basic logging function in debug mode only, is there any way I can make it so that the second defintion doesn't output anything to the standard output? I've tried setting output to various things but I get compile errors. Looking this up just gives me advice on how to flush the buffer which isn't what I want

[severe karma]

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[hazy pilot]

Why not just remove that line?

[proper spire]

Wdym "remove that line"

How can you remove lines from std::cout?

[hazy pilot]

Output<<"";

[proper spire]

Ohh, that doesn't work it still outputs it

[hazy pilot]

Make the function body empty

[hazy pilot]

Remove this line

[proper spire]

because the input to my function is std::cout << "my string"....etc

so it will still output which is why i need a way to set that std::cout variable to nothing, or remove the data from the output buffer or something

[hazy pilot]

That is because it is evaluated before it is passed to the function

You could make the stream and the output string two separate arguments

[proper spire]

but if i pass it into the function and do what i have in the first definition it only outputs the string once

[proper spire]

I can't chain multiple different statements then, like std::cout << "string" << x; etc

[hazy pilot]

When you call LOG_INFO(cout<<"text") the expression cout<<"text" returns the stream cout which is what is passed into the function

[azure thistle]

Hello, @everyone

[severe karma]

Did you really just try to ping 33,950 people?

[proper spire]

Yes, i need a way to change the state of that stream so that nothing is output to the standard output

[azure thistle]

what's the matter?

I can help you

[proper spire]

read up

[hazy pilot]

You can use std::format or std::stringstream to construct a string to pass to the functiob

[azure thistle]

This technique is often used for logging purposes, where you might want to include or exclude logging statements based on whether the program is being compiled in debug mode (NDEBUG not defined) or release mode (NDEBUG defined). In release mode, you typically want to exclude debugging/logging statements to improve performance and reduce binary size.

[proper spire]

chatGPT lmao

[proper spire]

thanks a lot, this is exactly what i need

[hazy pilot]

<@&847915341954154536>

If the function body is empty when not debugging the compiler can optimise out the function call

[severe karma]

@proper spire Has your question been resolved? If so, type !solved :)

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[proper spire]

!solved

[severe karma]

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