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authorBoris Kolpackov <boris@codesynthesis.com>2009-09-17 07:15:29 +0200
committerBoris Kolpackov <boris@codesynthesis.com>2009-09-17 07:15:29 +0200
commitf0510d2f90467de8e8f260b47d79a9baaf9bef17 (patch)
tree0b9929946f06a9cbe9b9e8f2a7600dae4e048f79 /examples/cxx/tree/performance/time.hxx
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+// file : examples/cxx/tree/performance/time.hxx
+// author : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#ifndef TIME_HXX
+#define TIME_HXX
+
+#include <iosfwd> // std::ostream&
+
+namespace os
+{
+ class time
+ {
+ public:
+ class failed {};
+
+ // Create a time object representing the current time.
+ //
+ time ();
+
+ time (unsigned long long nsec)
+ {
+ sec_ = static_cast<unsigned long> (nsec / 1000000000ULL);
+ nsec_ = static_cast<unsigned long> (nsec % 1000000000ULL);
+ }
+
+ time (unsigned long sec, unsigned long nsec)
+ {
+ sec_ = sec;
+ nsec_ = nsec;
+ }
+
+ public:
+ unsigned long
+ sec () const
+ {
+ return sec_;
+ }
+
+ unsigned long
+ nsec () const
+ {
+ return nsec_;
+ }
+
+ public:
+ class overflow {};
+ class underflow {};
+
+ time
+ operator+= (time const& b)
+ {
+ unsigned long long tmp = 0ULL + nsec_ + b.nsec_;
+
+ sec_ += static_cast<unsigned long> (b.sec_ + tmp / 1000000000ULL);
+ nsec_ = static_cast<unsigned long> (tmp % 1000000000ULL);
+
+ return *this;
+ }
+
+ time
+ operator-= (time const& b)
+ {
+ if (*this < b)
+ throw underflow ();
+
+ sec_ -= b.sec_;
+
+ if (nsec_ < b.nsec_)
+ {
+ --sec_;
+ nsec_ += 1000000000ULL - b.nsec_;
+ }
+ else
+ nsec_ -= b.nsec_;
+
+ return *this;
+ }
+
+ friend time
+ operator+ (time const& a, time const& b)
+ {
+ time r (a);
+ r += b;
+ return r;
+ }
+
+ friend time
+ operator- (time const& a, time const& b)
+ {
+ time r (a);
+ r -= b;
+ return r;
+ }
+
+ friend bool
+ operator < (time const& a, time const& b)
+ {
+ return (a.sec_ < b.sec_) || (a.sec_ == b.sec_ && a.nsec_ < b.nsec_);
+ }
+
+ private:
+ unsigned long sec_;
+ unsigned long nsec_;
+ };
+
+ std::ostream&
+ operator<< (std::ostream&, time const&);
+}
+
+#endif // TIME_HXX