ArenaAllocatorBase.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
#include "AthAllocators/ArenaAllocatorBase.h"
#include <ostream>
#include <iomanip>
 
 
namespace SG {
 

ArenaAllocatorBase::Stats::Stat::Stat()
  : inuse (0),
    free (0),
    total (0)
{
}
 

void ArenaAllocatorBase::Stats::Stat::clear()
{
  inuse = free = total = 0;
}
 

ArenaAllocatorBase::Stats::Stat&
ArenaAllocatorBase::Stats::Stat::operator+= (const Stat& other)
{
  inuse += other.inuse;
  free += other.free;
  total += other.total;
  return *this;
}
 
 
/* (hide from doxygen)
 * @brief Format a statistic structure.
 * @param os The stream to which to write.
 * @param stat The statistic structure to write.
 */
std::ostream& operator<< (std::ostream& os,
                          const ArenaAllocatorBase::Stats::Stat& stat)
{
  std::print (os, "{}", stat);
  return os;
}
 
 
//===========================================================================
 

void ArenaAllocatorBase::Stats::clear()
{
  elts.clear();
  bytes.clear();
  blocks.clear();
}
 

ArenaAllocatorBase::Stats&
ArenaAllocatorBase::Stats::operator+= (const Stats& other)
{
  elts += other.elts;
  bytes += other.bytes;
  blocks += other.blocks;
  return *this;
}
 
 
/* (hide from doxygen)
 * @brief Format a complete statistics structure.
 * @param os The stream to which to write.
 * @param stats The statistics structure to write.
 */
std::ostream& operator<< (std::ostream& os,
                          const ArenaAllocatorBase::Stats& stats)
{
  std::print (os, "{}", stats);
  return os;
}
 

void ArenaAllocatorBase::Stats::header (std::ostream& os)
{
  std::print (os, "Elts InUse/Free/Total"
              "   Bytes InUse/Free/Total  Blocks InUse/Free/Total");
}
 
 
//===========================================================================
 

void ArenaAllocatorBase::report (std::ostream& os) const
{
  std::println (os, " {}  {}", stats(), name());
}
 
 
} // namespace SG
 

template <class FmtContext>
typename FmtContext::iterator
std::formatter<SG::ArenaAllocatorBase::Stats::Stat>::format (const SG::ArenaAllocatorBase::Stats::Stat& stat, FmtContext& ctx) const
{
  return std::format_to (ctx.out(), "{:7}/{:7}/{:7}", stat.inuse, stat.free, stat.total);
}
 

template <class FmtContext>
typename FmtContext::iterator
std::formatter<SG::ArenaAllocatorBase::Stats>::format (const SG::ArenaAllocatorBase::Stats& stats, FmtContext& ctx) const
{
  return std::format_to (ctx.out(), "{} {} {}", stats.elts, stats.bytes, stats.blocks);
}