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Modern C++ (11\14\17)

C++17

Topic	Description
initalization list	more (…) Initalization List
inline variables	more (…) inline variables
anonymous namespaces	more (…) anonymous namespaces
nested namespaces	more (…) nested namespaces
template decuction	more (…) template deduction
initializer if-statement	more (…) initializer if-statement
structure unbinding	more (…) structure binding
string_view	more (…) string_view
filesystem	more (…) filesystem
parallel algorithms	more (…) Parallel Algorithms

Lambdas

Topic	Description
lambda recursive	more (…) lambda recursive
capture *this (c++17)	more (…) *this (C++17)
lambdas as callback	more (…) lambda as callback
monads	more (…) Source Code
others	more (…) Source Code

mutable

Mutable keyword can be used for change a value using a const function

source: https://stackoverflow.com/questions/105014/does-the-mutable-keyword-have-any-purpose-other-than-allowing-the-variable-to

#include <iostream>

using namespace std;

class Test
{
public:
	Test() = default;
	
	//silly method just for demonstration prospose
	void increment() const 
	{
		Id++;
	}
	
	inline int get() const 
	{
		return Id++;
	}
	
private:
	mutable unsigned int Id = 0;
};

int main()
{
	Test tt = {};
	tt.increment();
	cout << tt.get() << endl;
	
	//capture by value
	int x = 1;
	auto f = [=]() mutable { x = 42; };
	f();
	cout << x <<  " - " <<  endl;
	
	return 0;
}

Variadic Templates

Example from: Modern C++ programming cookbook

#include <string>
#include <algorithm>
#include <vector>

using namespace std;

template < typename ... Ts > 
auto sum (Ts ... ts)
{
    return (ts + ...);
}

template< typename R, typename ... Ts>
auto matches( const R& range, Ts ... ts)
{
    return (std::count(std::begin(range), std::end(range), ts) + ... );
}

template <typename T, typename ... Ts>
bool within(T  min, T max, Ts ... ts)
{
    return ((min <= ts && ts <= max) && ...);
}

template<typename T, typename ... Ts>
void collapse_vectors(std::vector<T> &vec, Ts ... ts)
{
    (vec.push_back(ts), ...);
}

template <typename T>
void printline(T t) 
{
     cout << t ; 
}


int main ()
{
    int the_sum { sum (1, 2, 3, 4, 5)};
    cout << "Sum: " << the_sum << endl;
  
    string a {"Hello"};
    string b {" World "};
    cout << sum ( a, b ) << endl;
  
    vector<int> v { 1,2,3,4,5}; 
    cout << "Nr. of finds = " << matches(v, 2,5) << endl;


    cout << "is between = " << within(10, 20, 12, 15) << endl;
    cout << "is between = " << within(10, 20, 45, 55) << endl;

    std::vector<int> vv {1,2,3};    
    collapse_vectors( vv, 5,6,8);
    for_each(vv.begin(), vv.end(), printline<int>);
}

Another example: Source Code

Move semantics

Source Code

Features by standard

C++11 C++14 C++17