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QLayoutPolicy: fix annoying -Wdeprecated-enum-enum-conversion

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Says GCC -std=c++20:

    src/gui/util/qlayoutpolicy_p.h:127:30: warning: bitwise operation between different enumeration types ‘QLayoutPolicy::Policy’ and ‘QLayoutPolicy::PolicyFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
      127 |         if (verticalPolicy() & ExpandFlag)
          |             ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~

Fix by making Policy a QFlags<PolicyFlag>, which we can do because the
class is private. In QSizePolicy, this would break BC.

Since a QFlags cannot be opened for constants like an enum, we need to
define the ex-Policy-enumerators as static inline constexpr objects
instead.

Change-Id: I29bc938f86508deed3f99ad9d1c1892547206c05
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
(cherry picked from commit 020191d2ef513b2dd925f27890229dba4ca338e3)
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
This commit is contained in:
Marc Mutz 2021-12-02 11:23:04 +01:00
parent 86a89417ab
commit 3dc20d8094
1 changed files with 10 additions and 10 deletions
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20
src/gui/util/qlayoutpolicy_p.h
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@ -67,7 +67,6 @@ class QVariant;
class Q_GUI_EXPORT QLayoutPolicy
{
Q_GADGET
Q_ENUMS(Policy)
public:
enum PolicyFlag {
@ -76,16 +75,16 @@ public:
ShrinkFlag = 4,
IgnoreFlag = 8
};
Q_DECLARE_FLAGS(Policy, PolicyFlag)
Q_FLAG(Policy)
enum Policy {
Fixed = 0,
Minimum = GrowFlag,
Maximum = ShrinkFlag,
Preferred = GrowFlag | ShrinkFlag,
MinimumExpanding = GrowFlag | ExpandFlag,
Expanding = GrowFlag | ShrinkFlag | ExpandFlag,
Ignored = ShrinkFlag | GrowFlag | IgnoreFlag
};
static constexpr inline Policy Fixed = {};
static constexpr inline Policy Minimum = GrowFlag;
static constexpr inline Policy Maximum = ShrinkFlag;
static constexpr inline Policy Preferred = Minimum | Maximum;
static constexpr inline Policy MinimumExpanding = Minimum | ExpandFlag;
static constexpr inline Policy Expanding = Preferred | ExpandFlag;
static constexpr inline Policy Ignored = Preferred | IgnoreFlag;
enum ControlType {
DefaultType = 0x00000001,
@ -169,6 +168,7 @@ private:
};
};
Q_DECLARE_OPERATORS_FOR_FLAGS(QLayoutPolicy::Policy)
Q_DECLARE_OPERATORS_FOR_FLAGS(QLayoutPolicy::ControlTypes)
#ifndef QT_NO_DATASTREAM