Merge "Flattenable: switch from assignment to memcpy()."

#include <stdint.h>

#include <string.h>

#include <sys/types.h>

#include <utils/Errors.h>

#include <utils/Debug.h>

#include <type_traits>

namespace android {

    // write a POD structure

    template<typename T>

    static void write(void*& buffer, size_t& size, const T& value) {

        *static_cast<T*>(buffer) = value;

        static_assert(std::is_trivially_copyable<T>::value,

                      "Cannot flatten a non-trivially-copyable type");

        memcpy(buffer, &value, sizeof(T));

        advance(buffer, size, sizeof(T));

    }

    // read a POD structure

    template<typename T>

    static void read(void const*& buffer, size_t& size, T& value) {

        value = *static_cast<T const*>(buffer);

        static_assert(std::is_trivially_copyable<T>::value,

                      "Cannot unflatten a non-trivially-copyable type");

        memcpy(&value, buffer, sizeof(T));

        advance(buffer, size, sizeof(T));

    }

};