Learn how the transform function is used to perform bulk transformations on the elements of a container, using a supplied operator function.
- [Narrator] The transform function…is used to run bulk transformations…on elements in a container.…Here I have a working copy of transform.cpp…from chapter four of the exercise files.…The transform template function…is found in the algorithm header…and we'll get back to these template class…and functions at the top here in a minute.…Take a look at the transform function itself.…This version of it takes four arguments.…
The first is a starting point iterator…and its input iterator…so it only needs to end forward.…The second is also an input iterator…for the endpoint of the source container.…So these first two are the begin point…and the endpoint of this first container,…and the third one is the begin point…of the destination container and it is of course…an output iterator.…The fourth argument is an object operator.…It's a unary function, so it's a pointer…to either a function or a object functor…that takes one argument.…
In this case it's pointing to X.…And you see that X is declared up here…as an object of the class accum,…
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: The transform function