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#ifndef UTIL_SCOPED__
#define UTIL_SCOPED__
#include "util/exception.hh"
/* Other scoped objects in the style of scoped_ptr. */
#include <cstddef>
#include <cstdlib>
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_malloc {
public:
scoped_malloc() : p_(NULL) {}
scoped_malloc(void *p) : p_(p) {}
~scoped_malloc() { std::free(p_); }
void reset(void *p = NULL) {
scoped_malloc other(p_);
p_ = p;
}
void call_realloc(std::size_t to) {
void *ret;
UTIL_THROW_IF(!(ret = std::realloc(p_, to)) && to, util::ErrnoException, "realloc to " << to << " bytes failed.");
p_ = ret;
}
void *get() { return p_; }
const void *get() const { return p_; }
private:
void *p_;
scoped_malloc(const scoped_malloc &);
scoped_malloc &operator=(const scoped_malloc &);
};
// 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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