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// Copyright (C) 2022 Intel Corporation.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QTMOCHELPERS_H
#define QTMOCHELPERS_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists to be used by the code that
// moc generates. This file will not change quickly, but it over the long term,
// it will likely change or even be removed.
//
// We mean it.
//
#include <QtCore/qglobal.h>
#include <algorithm> // std::min
#include <limits>
#if 0
#pragma qt_no_master_include
#endif
QT_BEGIN_NAMESPACE
namespace QtMocHelpers {
// The maximum Size of a string literal is 2 GB on 32-bit and 4 GB on 64-bit
// (but the compiler is likely to give up before you get anywhere near that much)
static constexpr size_t MaxStringSize =
(std::min)(size_t((std::numeric_limits<uint>::max)()),
size_t((std::numeric_limits<qsizetype>::max)()));
template <uint... Nx> constexpr size_t stringDataSizeHelper(std::integer_sequence<uint, Nx...>)
{
// same as:
// return (0 + ... + Nx);
// but not using the fold expression to avoid exceeding compiler limits
size_t total = 0;
uint sizes[] = { Nx... };
for (uint n : sizes)
total += n;
return total;
}
template <int Count, size_t StringSize> struct StringData
{
static_assert(StringSize <= MaxStringSize, "Meta Object data is too big");
uint offsetsAndSizes[Count] = {};
char stringdata0[StringSize] = {};
constexpr StringData() = default;
};
template <uint... Nx> constexpr auto stringData(const char (&...strings)[Nx])
{
constexpr size_t StringSize = stringDataSizeHelper<Nx...>({});
constexpr size_t Count = 2 * sizeof...(Nx);
StringData<Count, StringSize> result;
const char *inputs[] = { strings... };
uint sizes[] = { Nx... };
uint offset = 0;
char *output = result.stringdata0;
for (size_t i = 0; i < sizeof...(Nx); ++i) {
// copy the input string, including the terminating null
uint len = sizes[i];
for (uint j = 0; j < len; ++j)
output[offset + j] = inputs[i][j];
result.offsetsAndSizes[2 * i] = offset + sizeof(result.offsetsAndSizes);
result.offsetsAndSizes[2 * i + 1] = len - 1;
offset += len;
}
return result;
}
# define QT_MOC_HAS_STRINGDATA 1
} // namespace QtMocHelpers
QT_END_NAMESPACE
QT_USE_NAMESPACE
#endif // QTMOCHELPERS_H
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