title: Problems with std::chrono
body: <p>I am having trouble compiling with chrono, here is the code:</p>
  
  <p>Time.hh</p>
  
  <pre><code>#include        &lt;chrono&gt;
  
  class           Time
  {
  protected:
    std::chrono::steady_clock::time_point _start_t;
    std::chrono::steady_clock::time_point _now;
    std::chrono::steady_clock::time_point _time;
  public:
    Time();
    Time(const Time &amp;other);
    Time          &amp;operator=(const Time &amp;other);
    ~Time();
  public:
    void          start();
    double        getDurSec();
    double        getDurMilSec();
  private:
    void          setNow();
  };
  </code></pre>
  
  <p>Compilation error:</p>
  
  <pre><code>g++  -W -Wall -Wextra -I./include -std=c++0x  -c -o src/Time/Time.o src/Time/Time.cpp
  In file included from src/Time/Time.cpp:11:0:
  ./include/Time/Time.hh:21:3: error: ‘steady_clock’ in namespace ‘std::chrono’ does not     name a type
  ./include/Time/Time.hh:22:3: error: ‘steady_clock’ in namespace ‘std::chrono’ does not name a type
  ./include/Time/Time.hh:23:3: error: ‘steady_clock’ in namespace ‘std::chrono’ does not name a type
  src/Time/Time.cpp: In member function ‘void Time::start()’:
  src/Time/Time.cpp:34:2: error: ‘_time’ was not declared in this scope
  src/Time/Time.cpp:34:23: error: ‘std::chrono::steady_clock’ has not been declared
  </code></pre>
  
  <p>Etc...</p>
  
  <p>Tell me if you need more informations.</p>