61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
/* -*- c++ -*- ----------------------------------------------------------
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LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
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https://www.lammps.org/, Sandia National Laboratories
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LAMMPS development team: developers@lammps.org
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Copyright (2003) Sandia Corporation. Under the terms of Contract
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DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
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certain rights in this software. This software is distributed under
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the GNU General Public License.
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See the README file in the top-level LAMMPS directory.
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------------------------------------------------------------------------- */
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#ifndef LMP_SAFE_POINTERS_H
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#define LMP_SAFE_POINTERS_H
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// collection of smart pointers for specific purposes
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#include <cstdio>
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namespace LAMMPS_NS {
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/** Class to automatically close a FILE pointer when a class instance goes out of scope.
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\verbatim embed:rst
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Drop in replacement for ``FILE *``. Use as ``SafeFilePtr fp;`` instead of
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``FILE *fp = nullptr;`` and there is no more need to explicitly call
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``fclose(fp)``.
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\endverbatim
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*/
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class SafeFilePtr {
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public:
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SafeFilePtr() : fp(nullptr) {};
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SafeFilePtr(FILE *_fp) : fp(_fp) {};
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SafeFilePtr(const SafeFilePtr &) = delete;
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SafeFilePtr(SafeFilePtr &&o) noexcept : fp(o.fp) { o.fp = nullptr; }
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SafeFilePtr &operator=(const SafeFilePtr &) = delete;
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~SafeFilePtr()
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{
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if (fp) fclose(fp);
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}
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SafeFilePtr &operator=(FILE *_fp)
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{
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if (fp && (fp != _fp)) fclose(fp);
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fp = _fp;
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return *this;
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}
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operator FILE *() const { return fp; }
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private:
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FILE *fp;
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};
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} // namespace LAMMPS_NS
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#endif
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