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#ifndef UTIL_SCOPED__
#define UTIL_SCOPED__
/* Other scoped objects in the style of scoped_ptr. */
#include <cstddef>
#include <cstdio>
namespace util {
template <class T, class R, R (*Free)(T*)> class scoped_thing {
public:
explicit scoped_thing(T *c = static_cast<T*>(0)) : c_(c) {}
~scoped_thing() { if (c_) Free(c_); }
void reset(T *c) {
if (c_) Free(c_);
c_ = c;
}
T &operator*() { return *c_; }
const T&operator*() const { return *c_; }
T &operator->() { return *c_; }
const T&operator->() const { return *c_; }
T *get() { return c_; }
const T *get() const { return c_; }
private:
T *c_;
scoped_thing(const scoped_thing &);
scoped_thing &operator=(const scoped_thing &);
};
class scoped_fd {
public:
scoped_fd() : fd_(-1) {}
explicit scoped_fd(int fd) : fd_(fd) {}
~scoped_fd();
void reset(int to) {
scoped_fd other(fd_);
fd_ = to;
}
int get() const { return fd_; }
int operator*() const { return fd_; }
int release() {
int ret = fd_;
fd_ = -1;
return ret;
}
private:
int fd_;
scoped_fd(const scoped_fd &);
scoped_fd &operator=(const scoped_fd &);
};
class scoped_FILE {
public:
explicit scoped_FILE(std::FILE *file = NULL) : file_(file) {}
~scoped_FILE();
std::FILE *get() { return file_; }
const std::FILE *get() const { return file_; }
void reset(std::FILE *to = NULL) {
scoped_FILE other(file_);
file_ = to;
}
private:
std::FILE *file_;
};
// Hat tip to boost.
template <class T> class scoped_array {
public:
explicit scoped_array(T *content = NULL) : c_(content) {}
~scoped_array() { delete [] c_; }
T *get() { return c_; }
const T* get() const { return c_; }
T &operator*() { return *c_; }
const T&operator*() const { return *c_; }
T &operator->() { return *c_; }
const T&operator->() const { return *c_; }
T &operator[](std::size_t idx) { return c_[idx]; }
const T &operator[](std::size_t idx) const { return c_[idx]; }
void reset(T *to = NULL) {
scoped_array<T> other(c_);
c_ = to;
}
private:
T *c_;
};
} // namespace util
#endif // UTIL_SCOPED__
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