问题
constexpr 函数 “qCountLeadingZeroBits” 不会生成常数表达式 (编译源文件 main.cpp) QtGuiApplication1
报错在 qalgorithms.h 文件中
解决办法
#define QT_POPCOUNT_CONSTEXPR
+#define QT_POPCOUNT_RELAXED_CONSTEXPR
#define QT_HAS_BUILTIN_CTZ
Q_ALWAYS_INLINE unsigned long qt_builtin_ctz(quint32 val)
{
@@ -676,6 +677,7 @@
#ifndef QT_POPCOUNT_CONSTEXPR
#define QT_POPCOUNT_CONSTEXPR Q_DECL_CONSTEXPR
+#define QT_POPCOUNT_RELAXED_CONSTEXPR Q_DECL_RELAXED_CONSTEXPR
#endif
} //namespace QAlgorithmsPrivate
@@ -819,7 +821,7 @@
#endif
}
-Q_DECL_RELAXED_CONSTEXPR inline uint qCountLeadingZeroBits(quint8 v) Q_DECL_NOTHROW
+QT_POPCOUNT_RELAXED_CONSTEXPR inline uint qCountLeadingZeroBits(quint8 v) Q_DECL_NOTHROW
{
#if defined(QT_HAS_BUILTIN_CLZ)
return v ? QAlgorithmsPrivate::qt_builtin_clz(v)-24U : 8U;
@@ -831,7 +833,7 @@
#endif
}
-Q_DECL_RELAXED_CONSTEXPR inline uint qCountLeadingZeroBits(quint16 v) Q_DECL_NOTHROW
+QT_POPCOUNT_RELAXED_CONSTEXPR inline uint qCountLeadingZeroBits(quint16 v) Q_DECL_NOTHROW
{
#if defined(QT_HAS_BUILTIN_CLZS)
return v ? QAlgorithmsPrivate::qt_builtin_clzs(v) : 16U;
@@ -844,7 +846,7 @@
#endif
}
-Q_DECL_RELAXED_CONSTEXPR inline uint qCountLeadingZeroBits(quint64 v) Q_DECL_NOTHROW
+QT_POPCOUNT_RELAXED_CONSTEXPR inline uint qCountLeadingZeroBits(quint64 v) Q_DECL_NOTHROW
{
#if defined(QT_HAS_BUILTIN_CLZLL)
return v ? QAlgorithmsPrivate::qt_builtin_clzll(v) : 64U;
@@ -859,7 +861,7 @@
#endif
}
-Q_DECL_RELAXED_CONSTEXPR inline uint qCountLeadingZeroBits(unsigned long v) Q_DECL_NOTHROW
+QT_POPCOUNT_RELAXED_CONSTEXPR inline uint qCountLeadingZeroBits(unsigned long v) Q_DECL_NOTHROW
{
return qCountLeadingZeroBits(QIntegerForSizeof<long>::Unsigned(v));
}
+ 就是 添加
- 就是删除