/usr/include/gromacs/options/ivaluestore.h is in libgromacs-dev 2018.1-1.
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/*! \file
 * \brief
 * Declares gmx::IOptionValueStore.
 *
 * \author Teemu Murtola <teemu.murtola@gmail.com>
 * \ingroup module_options
 */
#ifndef GMX_OPTIONS_IVALUESTORE_H
#define GMX_OPTIONS_IVALUESTORE_H
namespace gmx
{
template <typename T> class ArrayRef;
/*! \internal
 * \brief
 * Represents the final storage location of option values.
 *
 * \todo
 * Try to make this more like a write-only interface, getting rid of the need
 * to access the stored values through this interface.  That would simplify
 * things.
 *
 * \ingroup module_options
 */
template <typename T>
class IOptionValueStore
{
    public:
        virtual ~IOptionValueStore() {}
        //! Returns the number of values stored so far.
        virtual int valueCount() = 0;
        //! Returns a reference to the actual values.
        virtual ArrayRef<T> values() = 0;
        //! Removes all stored values.
        virtual void clear() = 0;
        //! Reserves memory for additional `count` entries.
        virtual void reserve(size_t count) = 0;
        //! Appends a value to the store.
        virtual void append(const T &value) = 0;
};
} // namespace gmx
#endif
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