Learn how the STL provides arithmetic functors for use with transform and other functions that require operator functions.
- The arithmetic functors are standard template functors…defined in the functional header, it's right there,…of the STL.…Here I have a working copy of arithmetic.cpp…from chapter five of the exercise files.…And I've defined down here three vectors,…v1, v2, which have some numbers that we'll do arithmetic on,…and v3 for the results.…I have a functor defined, this is the plus functor,…I've created an object from the class,…course if we wanted to we could use the functor directly…like this with parentheses with a function call operator.…
Really to get the full value of a functor,…you'll want to use it as an object.…So when I build and run,…you'll notice that the plus functor…adds these numbers together,…so 26 plus one is 27,…52 plus two is 54, et cetera.…The minus functor,…will subtract the two numbers.…So we're using the binary version of transform here.…It has the five arguments.…
And here we got the subtraction.…We can multiply with the multiplies functor.…Build and run we have the product of those two numbers.…And we can divide with the divides functor.…
Author
Released
12/20/2018- Template fundamentals
- STL containers
- Accessing iterators
- Output, forward, and bidirectional iterators
- The transform function
- Transforming strings and types
- Arithmetic, relational, and logical functions
- STL algorithms
Skill Level Intermediate
Duration
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Introduction
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1. Templates
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What is a template?4m 43s
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Template syntax1m 48s
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Template specialization1m 49s
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Template variables4m 14s
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Impact on header files3m 13s
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Type inference6m 45s
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Argument deduction3m 15s
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2. STL Containers
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3. STL Iterators
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Accessing iterators2m 28s
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Input iterators2m 2s
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Output iterators1m 27s
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Forward iterators1m 58s
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Bidirectional iterators1m 59s
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Random access iterators2m 2s
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4. Transformations
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The transform function5m 28s
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Lambda transformations4m 23s
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Transforming strings2m 49s
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Binary transformations3m 7s
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Transforming types3m 3s
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5. STL Functions
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About functors1m 46s
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Arithmetic functors2m 10s
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Relational functors3m 13s
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Logical functors1m 31s
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6. STL Algorithm
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About STL algorithms1m 42s
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Testing conditions2m 36s
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Searching and counting4m 38s
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Replacing and removing4m 14s
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Modifying algorithms5m 46s
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Partitions2m 52s
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Sorting3m 42s
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Merging sequences2m 4s
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Binary searches3m 57s
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Conclusion
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Goodbye1m 29s
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Video: Arithmetic functors