How can I use Iterator methods of strings in my C++ software apps? What kind of iterator methods I can use with a std::string? How can I use begin(), end() iterator methods with strings? the at() method of strings? Can I use front() and back() methods in std::string to access characters?
Modern C++ uses Strings, Wide Strings, and Unicode Strings to support worldwide…
How can I access a character of a wstring? How can I use the at() method of wide strings in modern C++ software? Can I use front() and back() methods in std::wstring to access characters?
Modern C++ uses Wide Strings and Unicode Strings to support worldwide…
In this post, you’ll get answers to these questions:
What are the Vectors in C++?How can we use std::vector?How can I define vectors for different data types?Can I define structs or other datatypes in std::vector?
By learning how to define vectors in modern C++ on…
In this post, you’ll get answers to these questions:
What are the Vectors in C++?How can I use the front() iterator method on vectors?How can I use the back() iterator method on vectors?Can I get the last member of a vector by using the back() method?How can I access the first element of a vector?Can I print out the first and the last members of vectors by using the front() and back()…
The iterator library that is part of the C++ Standard Library provides the following helpers for writing generic code:
#include // helpers are defined here
template
void foo(Container& c)
{
// Generic way to obtain (constant) iterators
auto b = std::begin(c)…
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
void foo(Container& container)
{
for (auto element : container); // (1)
for (const auto…
Let’s slightly modify the example from The Move Iterator Adapter in C++ post:
#include
#include
#include
#include
/// @warning BUG! PLEASE, DON'T USE!
auto deep_copy_to_list(const std::vector& src)
{
std::list dst; // constructs the empty list
copy(cbegin(src), cend(src), begin(dst)); // cause memory corruption (if !src.empty())!
return dst;
}
In the example above the object of…
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
#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 reverse…
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…
