Troy demonstrates his solution to creating an integer summation function which can take a variable number parameters.
(upbeat electronic music)…- [Instructor] How'd it go, did you figure out a solution?…Hopefully, yes, it is somewhat similar…to reverse concatenating the strings.…Simply add the first to the remainders,…and don't forget the base case.…Let me show you how I did it.…We begin with the base case, this is…when we only have one argument,…and all it does is return that argument,…so it gets a V, sends a V back out.…Next, we handle the recursiveness.…
Note how the parameters are split up…between the first and the rest,…so we get the first here, we get the rest of them,…and we just say first, and then was say plus,…and we give it back the argument pack.…So it's going to go args star dot dot,…and send it back, and it's going to keep splitting…these up until there's only one,…and then that's going to end at the recursid,…and it's always adding itself together.…And finally, call the function with…a variable number of arguments,…and so that's right here, we're calling it,…and let's go ahead and run this, and see how it looks.…
Author
Released
12/6/2018- Major new C++ features
- Turning on modern C++
- Letting the compiler help
- Using the new features correctly
- Using auto type deduction
- Using lambdas
- Range-based for loops
- How C++ and the Standard Template Library name things
- Making the best of the filesystem library
- Managing objects
Skill Level Beginner
Duration
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Introduction
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1. What Is Modern C++?
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New C++ features56s
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Old code compatibility1m 1s
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2. Tools That Improve Your Code
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Let the compiler help1m 4s
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Static analyzers1m 3s
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Cppcheck4m 40s
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3. Using the New Features Correctly
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Range-based for loops1m 45s
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Strongly typed enums1m 58s
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Using lambdas2m 39s
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4. Don't Reinvent the Wheel
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Map, filter, and reduce4m 30s
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size_t and auto2m 38s
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The filesystem library4m 15s
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5. Managing Objects
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Challenge: RAII31s
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Solution: RAII2m 6s
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Conclusion
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Next steps42s
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Video: Solution: Writing an integer sum method