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/* Copyright (c) 2015, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#ifndef OPENSSL_HEADER_CRYPTO_TEST_STL_COMPAT_H
#define OPENSSL_HEADER_CRYPTO_TEST_STL_COMPAT_H
#include <assert.h>
#include <vector>
// This header contains re-implementations of library functions from C++11. They
// will be replaced with their standard counterparts once Chromium has C++11
// library support in its toolchain.
namespace bssl {
// vector_data is a reimplementation of |std::vector::data| from C++11.
template <class T>
static T *vector_data(std::vector<T> *out) {
return out->empty() ? nullptr : &(*out)[0];
}
template <class T>
static const T *vector_data(const std::vector<T> *out) {
return out->empty() ? nullptr : &(*out)[0];
}
// remove_reference is a reimplementation of |std::remove_reference| from C++11.
template <class T>
struct remove_reference {
using type = T;
};
template <class T>
struct remove_reference<T&> {
using type = T;
};
template <class T>
struct remove_reference<T&&> {
using type = T;
};
// move is a reimplementation of |std::move| from C++11.
template <class T>
typename remove_reference<T>::type &&move(T &&t) {
return static_cast<typename remove_reference<T>::type&&>(t);
}
// default_delete is a partial reimplementation of |std::default_delete| from
// C++11.
template <class T>
struct default_delete {
void operator()(T *t) const {
enum { type_must_be_complete = sizeof(T) };
delete t;
}
};
// nullptr_t is |std::nullptr_t| from C++11.
using nullptr_t = decltype(nullptr);
// unique_ptr is a partial reimplementation of |std::unique_ptr| from C++11. It
// intentionally does not support stateful deleters to avoid having to bother
// with the empty member optimization.
template <class T, class Deleter = default_delete<T>>
class unique_ptr {
public:
unique_ptr() : ptr_(nullptr) {}
unique_ptr(nullptr_t) : ptr_(nullptr) {}
unique_ptr(T *ptr) : ptr_(ptr) {}
unique_ptr(const unique_ptr &u) = delete;
unique_ptr(unique_ptr &&u) : ptr_(nullptr) {
reset(u.release());
}
~unique_ptr() {
reset();
}
unique_ptr &operator=(nullptr_t) {
reset();
return *this;
}
unique_ptr &operator=(unique_ptr &&u) {
reset(u.release());
return *this;
}
unique_ptr& operator=(const unique_ptr &u) = delete;
explicit operator bool() const {
return ptr_ != nullptr;
}
T &operator*() const {
assert(ptr_ != nullptr);
return *ptr_;
}
T *operator->() const {
assert(ptr_ != nullptr);
return ptr_;
}
T *get() const {
return ptr_;
}
T *release() {
T *ptr = ptr_;
ptr_ = nullptr;
return ptr;
}
void reset(T *ptr = nullptr) {
if (ptr_ != nullptr) {
Deleter()(ptr_);
}
ptr_ = ptr;
}
private:
T *ptr_;
};
} // namespace bssl
#endif // OPENSSL_HEADER_CRYPTO_TEST_STL_COMPAT_H
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