Function Template: Solve Complications with Mixing Types for Variable Swapping

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SUMMARY

The discussion focuses on the challenges of using C++ templates for swapping variables of different types, specifically between an integer and a double. The original attempt to use a single template parameter for the swap function fails due to type incompatibility when passing by reference. A solution is proposed using two template parameters, allowing for the swapping of variables of different types while maintaining type safety. The conversation also references examples from Ivor's book and highlights the importance of understanding template functions in C++.

PREREQUISITES
  • Understanding of C++ templates and their syntax
  • Knowledge of variable types in C++ (e.g., int, double)
  • Familiarity with function overloading and passing by reference
  • Basic understanding of type casting in C++
NEXT STEPS
  • Research "C++ template specialization" for advanced template usage
  • Learn about "C++ type traits" to understand type properties at compile time
  • Explore "C++ function overloading" to handle multiple types effectively
  • Study "C++ standard library algorithms" that utilize templates for generic programming
USEFUL FOR

C++ developers, software engineers working with templates, and anyone interested in type-safe programming practices in C++.

  • #61
Don't tell me in this case, cheapness doesn't pay. I downloaded Gaddis 6th edition for free, it has nothing of this kind at all. Wow, maybe I should pay some money and get a newer version. Now I have to guess reading codes!

Not just loop range based or the if else statement explained before. Don't they have a general name for this kind of simplified code. I just want to find a website that show the translation. I don't even know the name. I hate to ask every time I encounter this kind of simplified code. I am sure I can learn it just like that if I can have a table of translation.

Thanks
 
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  • #62
yungman said:
Don't tell me in this case, cheapness doesn't pay. I downloaded Gaddis 6th edition for free, it has nothing of this kind at all.
Gaddis's 6th ed. is copyrighted 2009, before the changes in C++. As John Arbuckle once said, "You get what you pay for." (Catch phrase used in ads for Yuban coffee)
yungman said:
Don't they have a general name for this kind of simplified code.
Not sure which simplified code you're asking about. Do you mean the braced initializer list (e.g.,
T result{ data[0] }; ) ?
 
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  • #63
yungman said:
Don't they have a general name for this kind of simplified code.
New features? C++ is a constantly evolving language, any book will become out of date.

yungman said:
I just want to find a website that show the translation.
I mostly use cppreference.com. As you can see there are new features introduced in c++20 (for example the spaceship operator), and there will be more coming in c++23.
 
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  • #64
Hi

I have been working on new stuffs using the book by Ivor, things that I never learned because the Gaddis I use is too old. So I have to take a detour to learn those. I think I cover the function templates quite well at this point. I just want to verify with you guys on my notes I have on typeid(), auto, decltype() and Trailing return type.

I find I like GeekForGeeks the best. It's the easiest to understand.

I attached my notes, I hope I am correct, if not, please let me know.

Thanks
 

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