In addition to Helpers for Generic C++ Code Iterating Over Sequences the C++17 Standard Library provides the following helpers for writing generic code:
#include <iterator> // new helpers of C++17 are defined here
template<class Container>
void foo(Container& c)
{
// Generic way to obtain:
auto data = std::data(c); // - data;
auto empty = std::empty(c); // - flag of…
The iterator library that is part of the C++ Standard Library provides the following helpers for writing generic code:
#include <iterator> // helpers are defined here
template<class Container>
void foo(Container& c)
{
// Generic way to obtain (constant)…
Since C++11 there are elegant way to access each element of a containers (or, more generally, sequences) – so called range-for-statement. The syntaxes are follow:
template<class Container>
void foo(Container& container)
{
for (auto element : container)…
Let’s slightly modify the example from The Move Iterator Adapter in C++ post:
#include <algorithm>
#include <list>
#include <string>
#include <vector>
/// @warning BUG! PLEASE, DON'T USE!
auto deep_copy_to_list(const std::vector<std::string>& src)
{
std::list<std::string> dst; // constructs the empty list
copy(cbegin(src), cend(src)…
The dereference prefix operator * being applied to iterator returns the lvalue reference to the element pointed by the iterator. Therefore, algorithms such as std::copy or std::transform calls copying constructors of processed elements, for example:
#include…
By using bidirectional iterator or random access iterator (see Iterator Categories in C++) it’s possible to traverse the sequence in backward direction by using operator -- or by using the special adapter template class std::reverse_iterator. But why to bother with…
Conceptually, iterators are consists of five categories:
input iterator is intended to traverse sequences in the forward direction and provides the read access to the pointed sequence element;output iterator is intended to traverse sequences in the forward direction and provides the write access to the pointed sequence element;forward iterator is intended to traverse sequences in the forward…
Iterator abstracts the concept of pointer to the sequence in range [begin, end), and thus provides the following basic operations:
dereference to obtain the current element;movement to point the next element;comparison to determine at least the end of…
In programming, one of the most used variables is text strings, and they are sometimes really important when storing and retrieving valuable data. It is important to store your data safely in its language and localization. Most programming languages have issues when storing…
If you are on the hunt for the best C/C++ compilers available today, this article lists the top C/C++ compilers for Windows with their features. It’s very hard, in fact, to identify which C++ compiler is the best for you, as this is mostly about what you want to achieve with your code. If you want to implement small projects for analysis and calculations without GUIs and many other features…
