65 lines
1.1 KiB
C++
65 lines
1.1 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include <cstring>
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namespace td {
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template <class T>
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class As {
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public:
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As(void *ptr) : ptr_(ptr) {
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}
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As(As &&) = default;
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As<T> &operator=(const As &new_value) && {
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memcpy(ptr_, new_value.ptr_, sizeof(T));
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return *this;
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}
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As<T> &operator=(const T new_value) && {
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memcpy(ptr_, &new_value, sizeof(T));
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return *this;
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}
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operator T() const {
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T res;
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memcpy(&res, ptr_, sizeof(T));
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return res;
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}
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private:
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void *ptr_;
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};
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template <class T>
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class ConstAs {
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public:
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ConstAs(const void *ptr) : ptr_(ptr) {
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}
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operator T() const {
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T res;
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memcpy(&res, ptr_, sizeof(T));
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return res;
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}
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private:
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const void *ptr_;
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};
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template <class ToT, class FromT>
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As<ToT> as(FromT *from) {
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return As<ToT>(from);
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}
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template <class ToT, class FromT>
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const ConstAs<ToT> as(const FromT *from) {
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return ConstAs<ToT>(from);
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}
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} // namespace td
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