Intro to "modern" C++

A pretty old language

C++ standards

  • C++98
  • C++11
  • C++14
  • C++17

Tiobe Index (2017)

  1. Java                 14.6%
  2. C                      7%
  3. C++                  4.7%
  4. Python            3.5%
  5. C#                    3.4%
  6. Visual Basic    3.39%
  7. JavaScript       3%

Vector iteration - C++ 98

#include <iostream>
#include <string>
#include <vector>

int main(int argc, char** argv)
{
  std::vector<std::string> list;
  list.push_back("hello");
  list.push_back("world");

  for(std::vector<std::string>::iterator it = list.begin(); it != list.end(); it ++)
  {
    std::string s = *it;
    std::cout << s << std::endl;
  }

  return 0;
}

Vector iteration - Modern C++

#include <iostream>
#include <string>
#include <vector>

int main(int argc, char** argv)
{
  std::vector<std::string> list = { "hello", "world" };

  for(auto s : list)
    std::cout << s << std::endl;

  return 0;
}

Vector iteration - Modern C++

#include <iostream>
#include <string>
#include <vector>

int main(int argc, char** argv)
{
  // Initializer lists
  std::vector<std::string> list = { "hello", "world" };

  // Auto types <3
  // Range based for loops
  for(auto s : list)
    std::cout << s << std::endl;

  return 0;
}

Lambda / async - C++ 98

#include <iostream>
#include <string>
#include <vector>
#include <pthread.h>

class Test
{
  public:
    Test(const std::string& name) : m_name(name) {}
    std::string getName() { return m_name; }
    
  private:
    std::string m_name;
};

void* async_do(void* cls)
{
  Test *t = static_cast<Test*>(cls);

  std::cout << t->getName() << std::endl;
}

int main(int argc, char** argv)
{
  Test t("Hello world");
  
  pthread_t thread;
  pthread_create(&thread, NULL, &async_do, &t);

  pthread_join(thread, NULL);

  return 0;
}

Lambda / async - Modern C++

#include <iostream>
#include <string>
#include <vector>
#include <thread>

class Test
{
  public:
    Test(const std::string& name) : m_name(name) {}
    std::string getName() { return m_name; }
    
  private:
    std::string m_name;
};

int main(int argc, char** argv)
{
  Test t("Hello world");

  std::thread([=]()
  {
    std::cout << t.getName() << std::endl;
  }).join();
  
  return 0;
}

Grab bag - Modern C++

// auto init lists
auto intlist = { 1, 2, 3 };

// nested namespaces
namespace A::B::C { int i; }

// structured bindings
auto tuple = std::make_tuple(1, "foo", 3.1);
auto [ i, s, f ] = tuple;
std::cout << i << s << f << std::endl;

// UTF-8 Literals
char x = u8'x';

Future? C++20(???)

  • Modules
  • Concepts
  • Co-routines
  • Transaction memory

Where to get it?

  • Clang
    • C++11 since 3.3
    • C++14 since 3.4
    • C++17 since 4.0  
  • GCC
    • C++11 since 4.8
    • C++14 since 6.1
    • C++17 since 7 (almost)
  • MSVC
    • C++11/14 since 2015
    • C++17 2017 adds stuff

Good luck!

http://github.com/tru/modern-cxx

Intro to "modern" C++

By Tobias Hieta

Intro to "modern" C++

  • 1,102
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