WIP: qtypes: add support for Qt alias types that don't match

Some times don't match the Rust types so add these missing types.

Closes #882

Author: ahayzen-kdab

crates/cxx-qt-lib/build.rs

@@ -136,6 +136,7 @@ fn main() {
         "core/qstringlist",
         "core/qt",
         "core/qtime",
+        "core/qtypes",
         "core/qurl",
         "core/qvariant/mod",
         "core/qvariant/qvariant_bool",
@@ -254,6 +255,7 @@ fn main() {
         "core/qstring",
         "core/qstringlist",
         "core/qtime",
+        "core/qtypes",
         "core/qurl",
         "core/qvariant/qvariant",
         "core/qvector/qvector",

crates/cxx-qt-lib/include/core/qtypes.h

@@ -0,0 +1,29 @@
+// clang-format off
+// SPDX-FileCopyrightText: 2023 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
+// clang-format on
+// SPDX-FileContributor: Andrew Hayzen <andrew.hayzen@kdab.com>
+//
+// SPDX-License-Identifier: MIT OR Apache-2.0
+#pragma once
+
+#include <cstdint>
+
+#include <QtCore/Qt>
+
+#include "rust/cxx.h"
+
+namespace rust {
+namespace cxxqtlib1 {
+
+::qint64
+qint64FromI64(::std::int64_t value);
+::std::int64_t
+qint64IntoI64(::qint64 value);
+
+::qsizetype
+qsizetypeFromIsize(::rust::isize value);
+::rust::isize
+qsizetypeIntoIsize(qsizetype value);
+
+}
+}

crates/cxx-qt-lib/src/core/mod.rs

@@ -78,6 +78,9 @@ pub use qt::{
 mod qtime;
 pub use qtime::QTime;
 
+mod qtypes;
+pub use qtypes::{QInt64, QSizeType};
+
 #[cfg(not(target_os = "emscripten"))]
 mod qtimezone;
 #[cfg(not(target_os = "emscripten"))]

crates/cxx-qt-lib/src/core/qtypes.cpp

@@ -0,0 +1,60 @@
+// clang-format off
+// SPDX-FileCopyrightText: 2024 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
+// clang-format on
+// SPDX-FileContributor: Andrew Hayzen <andrew.hayzen@kdab.com>
+//
+// SPDX-License-Identifier: MIT OR Apache-2.0
+#include "cxx-qt-lib/qtypes.h"
+
+#include "../assertion_utils.h"
+
+constexpr static ::std::array<::std::size_t, 1> arrSizeType{ sizeof(
+  ::std::size_t) };
+assert_alignment_and_size(::qsizetype,
+                          alignof(::std::size_t),
+                          arrSizeType,
+                          arrSizeType.size());
+
+constexpr static ::std::array<::std::size_t, 1> arrInt64{ sizeof(
+  ::std::int64_t) };
+assert_alignment_and_size(::qint64,
+                          alignof(::std::int64_t),
+                          arrInt64,
+                          arrInt64.size());
+
+// static_assert(!::std::is_trivially_copy_assignable<qsizetype>::value);
+// static_assert(!::std::is_trivially_copy_constructible<qsizetype>::value);
+
+// static_assert(!::std::is_trivially_destructible<qsizetype>::value);
+
+// static_assert(QTypeInfo<qsizetype>::isRelocatable);
+
+namespace rust {
+namespace cxxqtlib1 {
+
+::qint64
+qint64FromI64(::std::int64_t value)
+{
+  return static_cast<::qint64>(value);
+}
+
+::std::int64_t
+qint64IntoI64(::qint64 value)
+{
+  return static_cast<::std::int64_t>(value);
+}
+
+::qsizetype
+qsizetypeFromIsize(::rust::isize value)
+{
+  return static_cast<::qsizetype>(value);
+}
+
+::rust::isize
+qsizetypeIntoIsize(::qsizetype value)
+{
+  return static_cast<::rust::isize>(value);
+}
+
+}
+}

crates/cxx-qt-lib/src/core/qtypes.rs

@@ -0,0 +1,83 @@
+// SPDX-FileCopyrightText: 2023 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
+// SPDX-FileContributor: Andrew Hayzen <andrew.hayzen@kdab.com>
+//
+// SPDX-License-Identifier: MIT OR Apache-2.0
+
+use cxx::{type_id, ExternType};
+use std::mem::MaybeUninit;
+
+#[cxx::bridge]
+mod ffi {
+    unsafe extern "C++" {
+        include!("cxx-qt-lib/qtypes.h");
+
+        #[cxx_name = "qint64"]
+        type QInt64 = super::QInt64;
+
+        #[cxx_name = "qsizetype"]
+        type QSizeType = super::QSizeType;
+    }
+
+    #[namespace = "rust::cxxqtlib1"]
+    unsafe extern "C++" {
+        #[rust_name = "qint64_from_i64"]
+        fn qint64FromI64(value: i64) -> QInt64;
+        #[rust_name = "qint64_into_i64"]
+        fn qint64IntoI64(value: QInt64) -> i64;
+
+        #[rust_name = "qsizetype_from_isize"]
+        fn qsizetypeFromIsize(value: isize) -> QSizeType;
+        #[rust_name = "qsizetype_into_isize"]
+        fn qsizetypeIntoIsize(value: QSizeType) -> isize;
+    }
+}
+
+#[repr(C)]
+pub struct QInt64 {
+    _space: MaybeUninit<i64>,
+}
+
+impl From<i64> for QInt64 {
+    fn from(value: i64) -> Self {
+        ffi::qint64_from_i64(value)
+    }
+}
+
+impl From<QInt64> for i64 {
+    fn from(value: QInt64) -> Self {
+        ffi::qint64_into_i64(value)
+    }
+}
+
+// Safety:
+//
+// Static checks on the C++ side to ensure the size is the same.
+unsafe impl ExternType for QInt64 {
+    type Id = type_id!("qint64");
+    type Kind = cxx::kind::Trivial;
+}
+
+#[repr(C)]
+pub struct QSizeType {
+    _space: MaybeUninit<isize>,
+}
+
+impl From<isize> for QSizeType {
+    fn from(value: isize) -> Self {
+        ffi::qsizetype_from_isize(value)
+    }
+}
+
+impl From<QSizeType> for isize {
+    fn from(value: QSizeType) -> Self {
+        ffi::qsizetype_into_isize(value)
+    }
+}
+
+// Safety:
+//
+// Static checks on the C++ side to ensure the size is the same.
+unsafe impl ExternType for QSizeType {
+    type Id = type_id!("qsizetype");
+    type Kind = cxx::kind::Trivial;
+}