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The C++ Standard Library

You're reading from   The C++ Standard Library What every professional C++ programmer should know about the C++ standard library.

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Product type Paperback
Published in Dec 2019
Publisher
ISBN-13 9781838981129
Length 251 pages
Edition 2nd Edition
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Author (1):
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Rainer Grimm Rainer Grimm
Author Profile Icon Rainer Grimm
Rainer Grimm
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Toc

Table of Contents (19) Chapters Close

Reader Testimonials FREE CHAPTER Introduction 1. The Standard Library 2. Utilities 3. Interface of All Containers 4. Sequential Containers 5. Associative Container 6. Adaptors for Containers 7. Iterators 8. Callable Units 9. Algorithms 10. Numeric 11. Strings 12. String Views 13. Regular Expressions 14. Input and Output Streams 15. Filesystem library 16. Multithreading Index

for_each

std::for_each applies a unary callable to each element of its range. The range is given by the input iterators.

UnFunc std::for_each(InpIt first, InpIt second, UnFunc func)
void std::for_each(ExePol pol, FwdIt first, FwdIt second, UnFunc func)

std::for_each when used without an explicit execution policy is a special algorithm because it returns its callable argument. If you invoke std::for_each with a function object, you can store the result of the function call directly in the function object.

InpIt std::for_each_n(InpIt first, Size n, UnFunc func)
FwdIt std::for_each_n(ExePol pol, FwdIt first, Size n, UnFunc func)

std::for_each_n is new with C++17 and applies a unary callable to the first n elements of its range. The range is given by an input iterator and a size.

std::for_each
// forEach.cpp
...
#include <algorithm>
...
template <typename T>
class ContInfo{
public:
  void operator()(T t){
    num++;
    sum+= t;
  }
  int getSum() const{...
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