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NullInterrupter.h
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// Copyright Contributors to the OpenVDB Project
// SPDX-License-Identifier: MPL-2.0
//
/// @file NullInterrupter.h
#ifndef OPENVDB_UTIL_NULL_INTERRUPTER_HAS_BEEN_INCLUDED
#define OPENVDB_UTIL_NULL_INTERRUPTER_HAS_BEEN_INCLUDED
#include <openvdb/version.h>
namespace openvdb {
OPENVDB_USE_VERSION_NAMESPACE
namespace OPENVDB_VERSION_NAME {
namespace util {
/// @brief Base class for interrupters
///
/// The host application calls start() at the beginning of an interruptible operation,
/// end() at the end of the operation, and wasInterrupted() periodically during the
/// operation.
/// If any call to wasInterrupted() returns @c true, the operation will be aborted.
/// @note This interrupter was not virtual in a previous implementation, so it could
/// be compiled out, however it remains important to not call wasInterrupter() too
/// frequently so as to balance performance and the ability to interrupt an operation.
struct NullInterrupter
{
/// Default constructor
NullInterrupter() = default;
virtual ~NullInterrupter() = default;
/// Signal the start of an interruptible operation.
/// @param name an optional descriptive name for the operation
virtual void start(const char* name = nullptr) { (void)name; }
/// Signal the end of an interruptible operation.
virtual void end() { }
/// Check if an interruptible operation should be aborted.
/// @param percent an optional (when >= 0) percentage indicating
/// the fraction of the operation that has been completed
/// @note this method is assumed to be thread-safe.
virtual bool wasInterrupted(int percent = -1) { (void)percent; return false; }
/// Convenience method to return a reference to the base class from a derived class.
virtual NullInterrupter& interrupter() final {
return static_cast<NullInterrupter&>(*this);
}
}; // struct NullInterrupter
/// This method is primarily for backwards-compatibility as the ability to compile out
/// the call to wasInterrupted() is no longer supported.
template <typename T>
inline bool wasInterrupted(T* i, int percent = -1) { return i && i->wasInterrupted(percent); }
} // namespace util
} // namespace OPENVDB_VERSION_NAME
} // namespace openvdb
#endif // OPENVDB_UTIL_NULL_INTERRUPTER_HAS_BEEN_INCLUDED
openvdb::v11_0::util::wasInterrupted
bool wasInterrupted(T *i, int percent=-1)
Definition NullInterrupter.h:49
openvdb
Definition Exceptions.h:13
openvdb::v11_0::util::NullInterrupter::wasInterrupted
virtual bool wasInterrupted(int percent=-1)
Definition NullInterrupter.h:39
openvdb::v11_0::util::NullInterrupter::NullInterrupter
NullInterrupter()=default
Default constructor.
openvdb::v11_0::util::NullInterrupter::start
virtual void start(const char *name=nullptr)
Definition NullInterrupter.h:32
openvdb::v11_0::util::NullInterrupter::end
virtual void end()
Signal the end of an interruptible operation.
Definition NullInterrupter.h:34
openvdb::v11_0::util::NullInterrupter::interrupter
virtual NullInterrupter & interrupter() final
Convenience method to return a reference to the base class from a derived class.
Definition NullInterrupter.h:41
openvdb::v11_0::util::NullInterrupter::~NullInterrupter
virtual ~NullInterrupter()=default
OPENVDB_VERSION_NAME
#define OPENVDB_VERSION_NAME
The version namespace name for this library version.
Definition version.h.in:121
OPENVDB_USE_VERSION_NAMESPACE
#define OPENVDB_USE_VERSION_NAMESPACE
Definition version.h.in:212