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simply and cleanup the wall clock timer

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This commit is contained in:
Dane Springmeyer 2011-08-24 22:02:07 +00:00
parent d5eb58a46a
commit ae41899152
1 changed files with 23 additions and 15 deletions
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38
include/mapnik/wall_clock_timer.hpp
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@ -24,6 +24,7 @@
#define MAPNIK_WALL_CLOCK_TIMER_INCLUDED
#include <cstdlib>
#include <string>
#include <sys/time.h>
namespace mapnik {
@ -62,30 +63,37 @@ private:
class wall_clock_progress_timer : public wall_clock_timer
{
public:
wall_clock_progress_timer(std::ostream & os = std::cout, const char * base_message = "") : _os(os), _base_message(base_message) {}
wall_clock_progress_timer(std::ostream & os,
std::string const& base_message):
os_(os),
base_message_(base_message),
stopped_(false) {}
~wall_clock_progress_timer()
{
// A) Throwing an exception from a destructor is a Bad Thing.
// B) The progress_timer destructor does output which may throw.
// C) A progress_timer is usually not critical to the application.
// Therefore, wrap the I/O in a try block, catch and ignore all exceptions.
if (!stopped_)
stop();
}
void stop() {
stopped_ = true;
try
{
// use istream instead of ios_base to workaround GNU problem (Greg Chicares)
std::istream::fmtflags old_flags = _os.setf( std::istream::fixed,
std::istream::floatfield );
std::streamsize old_prec = _os.precision( 2 );
_os << _base_message << elapsed() << " ms\n" // "s" is System International d'Unites std
<< std::endl;
_os.flags( old_flags );
_os.precision( old_prec );
std::ostringstream s;
s.precision(2);
s << std::fixed;
s << elapsed() << " ms";
s << std::setw(15 - (int)s.tellp()) << std::right << "| " << base_message_ << "\n";
os_ << s.str();
}
catch (...) {} // eat any exceptions
}
private:
std::ostream & _os;
const char * _base_message;
std::ostream & os_;
std::string base_message_;
bool stopped_;
};
};