Utils

is_integral

Brief

Struct that holds a boolean value. True for the following types: bool, char, int, short int, long int, long int, long long int, unsigned int, unsigned short int, unsigned long int, unsigned long long int, char, signed char, unsigned char and wchar_t. False for anything else.

Usage

bool ft::is_integral<type_to_check>::value

Reference

• https://www.cplusplus.com/reference/type_traits/is_integral/

• https://accu.org/journals/overload/9/43/frogley_442/

enable_if

Brief

Enables a type if a given condition is met. Otherwise, it won’t compile.

Usage

typename ft::enable_if< !ft::is_integral<InputIterator>::value, InputIterator>::type* = nullptr i don’t really understand this

Reference

https://www.cplusplus.com/reference/type_traits/enable_if/

pair

Brief

Provides a way to store two heterogeneous objects as a single unit.

Usage

std::pair <std::string,double> product ("tomatoes",2.30);
product.first = "shoes";                  // the type of first is string
product.second = 39.90;                   // the type of second is double
std::cout << "The price of " << product1.first << " is $" << product1.second << '\n';

Reference

https://en.cppreference.com/w/cpp/utility/pair

Make pair

Brief

Automatically detects types and constructs a pair.

Usage

bar = std::make_pair (10.5,'A');

Reference

Equal

Brief

ft::equal(first1, last1, first2) Checks if every element iterating from first1 to last1 is equal to the elements iterating from first2

Usage

bool is_palindrome(const std::string& s) { return ft::equal(s.begin(), s.begin() + s.size()/2, s.rbegin()); }

Reference

https://www.enseignement.polytechnique.fr/informatique/INF478/docs/Cpp/en/cpp/algorithm/equal.html

Lexicographical compare

Brief

Performs lexicographical comparison (like the dictionaries) between two ranges of iterators.

Usage

char foo[]="Apple";
char bar[]="apartment";
std::cout << std::lexicographical_compare(foo,foo+5,bar,bar+9);

Reference

https://www.cplusplus.com/reference/algorithm/lexicographical_compare/ https://www.fluentcpp.com/2019/12/20/how-to-compare-cpp-containers/