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#ifndef GENERS_IOPTR_HH_
#define GENERS_IOPTR_HH_
#include "Alignment/Geners/interface/IOException.hh"
#include <string>
// "Silent" pointers for the I/O system
namespace gs {
template <typename T>
class IOProxy;
template <typename T>
class IOPtr {
template <typename T2>
friend class IOProxy;
public:
typedef T element_type;
inline IOPtr() : ptr_(0) {}
inline IOPtr(T *ptr) : ptr_(ptr) {}
IOPtr(const IOProxy<T> &p);
IOPtr &operator=(const IOProxy<T> &p);
inline IOPtr &operator=(const IOPtr &p) {
ptr_ = p.ptr_;
return *this;
}
// Typical pointer operations
inline T *get() const { return ptr_; }
inline T *operator->() const {
if (!ptr_)
throw gs::IOInvalidArgument("In gs::IOPtr::operator->: attempt to dereference null pointer");
return ptr_;
}
inline T &operator*() const {
if (!ptr_)
throw gs::IOInvalidArgument("In gs::IOPtr::operator*: attempt to dereference null pointer");
return *ptr_;
}
inline IOPtr &operator++() {
++ptr_;
return *this;
}
inline void operator++(int) { ++ptr_; }
inline IOPtr &operator--() {
--ptr_;
return *this;
}
inline void operator--(int) { --ptr_; }
// Implicit conversion to "bool"
inline operator bool() const { return !(ptr_ == 0); }
// Names are ignored during comparisons
inline bool operator==(const IOPtr &r) const { return ptr_ == r.ptr_; }
inline bool operator!=(const IOPtr &r) const { return ptr_ != r.ptr_; }
bool operator==(const IOProxy<T> &r) const;
bool operator!=(const IOProxy<T> &r) const;
// Should be able to work as with bare pointer inside the I/O code
inline T *&getIOReference() { return ptr_; }
inline T *const &getIOReference() const {
if (!ptr_)
throw gs::IOInvalidArgument(
"In gs::IOPtr::getIOReference: unusable "
"const reference to null pointer");
return ptr_;
}
private:
T *ptr_;
};
template <typename T>
class IOProxy {
template <typename T2>
friend class IOPtr;
public:
typedef T element_type;
inline IOProxy() : ptr_(0) {}
inline IOProxy(T *ptr) : ptr_(ptr) {}
inline IOProxy(T *ptr, const char *varname) : ptr_(ptr), name_(varname ? varname : "") {}
inline IOProxy(T *ptr, const std::string &varname) : ptr_(ptr), name_(varname) {}
inline IOProxy(const IOPtr<T> &p) : ptr_(p.ptr_) {}
inline IOProxy(const IOPtr<T> &p, const char *varname) : ptr_(p.ptr_), name_(varname ? varname : "") {}
inline IOProxy(const IOPtr<T> &p, const std::string &varname) : ptr_(p.ptr_), name_(varname) {}
inline IOProxy &operator=(const IOProxy &p) {
ptr_ = p.ptr_;
name_ = p.name_;
return *this;
}
inline IOProxy &operator=(const IOPtr<T> &p) {
ptr_ = p.ptr_;
name_ = "";
return *this;
}
// Get name
inline const std::string &name() const { return name_; }
// Set name
inline IOProxy &setName(const char *varname) {
name_ = varname ? varname : "";
return *this;
}
inline IOProxy &setName(const std::string &varname) {
name_ = varname;
return *this;
}
// Typical pointer operations
inline T *get() const { return ptr_; }
inline T *operator->() const {
if (!ptr_)
throw gs::IOInvalidArgument("In gs::IOProxy::operator->: attempt to dereference null pointer");
return ptr_;
}
inline T &operator*() const {
if (!ptr_)
throw gs::IOInvalidArgument("In gs::IOProxy::operator*: attempt to dereference null pointer");
return *ptr_;
}
inline IOProxy &operator++() {
++ptr_;
return *this;
}
inline void operator++(int) { ++ptr_; }
inline IOProxy &operator--() {
--ptr_;
return *this;
}
inline void operator--(int) { --ptr_; }
// Implicit conversion to "bool"
inline operator bool() const { return !(ptr_ == 0); }
// Names are ignored during comparisons
inline bool operator==(const IOProxy &r) const { return ptr_ == r.ptr_; }
inline bool operator!=(const IOProxy &r) const { return ptr_ != r.ptr_; }
inline bool operator==(const IOPtr<T> &r) const { return ptr_ == r.ptr_; }
inline bool operator!=(const IOPtr<T> &r) const { return ptr_ != r.ptr_; }
// Should be able to work as with bare pointer inside the I/O code
inline T *&getIOReference() { return ptr_; }
inline T *const &getIOReference() const {
if (!ptr_)
throw gs::IOInvalidArgument(
"In gs::IOProxy::getIOReference: unusable "
"const reference to null pointer");
return ptr_;
}
private:
T *ptr_;
std::string name_;
};
// Convenience function for making IOPtr objects
template <typename T>
inline IOPtr<T> make_IOPtr(T &obj) {
return IOPtr<T>(&obj);
}
// In the user code, the following function can be usually wrapped
// as follows:
//
// #define io_proxy(obj) gs::make_IOProxy( obj , #obj )
//
template <typename T>
inline IOProxy<T> make_IOProxy(T &obj, const char *name) {
return IOProxy<T>(&obj, name);
}
} // namespace gs
// IOPtr methods which could not be defined earlier
namespace gs {
template <typename T>
inline IOPtr<T>::IOPtr(const IOProxy<T> &p) : ptr_(p.ptr_) {}
template <typename T>
inline IOPtr<T> &IOPtr<T>::operator=(const IOProxy<T> &p) {
ptr_ = p.ptr_;
return *this;
}
template <typename T>
inline bool IOPtr<T>::operator==(const IOProxy<T> &r) const {
return ptr_ == r.ptr_;
}
template <typename T>
inline bool IOPtr<T>::operator!=(const IOProxy<T> &r) const {
return ptr_ != r.ptr_;
}
} // namespace gs
#endif // GENERS_IOPTR_HH_
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