Added lots of small utilities

2021-02-04 01:56:39 +01:00
parent 882383f762
commit b462eab362
9 changed files with 509 additions and 0 deletions
--- a/include/cppflags.h
+++ b/include/cppflags.h
@@ -0,0 +1,114 @@
+#pragma once
+
+// system includes
+#include <type_traits>
+#include <cstddef>
+#include <utility>
+#include <cstdint>
+
+namespace cpputils {
+class CppFlag
+{
+    using uint = unsigned int;
+    using ushort = unsigned short;
+
+    int i;
+public:
+    constexpr inline CppFlag(int value) noexcept : i(value) {}
+    constexpr inline operator int() const noexcept { return i; }
+
+    constexpr inline CppFlag(uint value) noexcept : i(int(value)) {}
+    constexpr inline CppFlag(short value) noexcept : i(int(value)) {}
+    constexpr inline CppFlag(ushort value) noexcept : i(int(uint(value))) {}
+    constexpr inline operator uint() const noexcept { return uint(i); }
+};
+
+template<typename Enum>
+class CppFlags
+{
+    static_assert((sizeof(Enum) <= sizeof(int)),
+                      "CppFlags uses an int as storage, so an enum with underlying "
+                      "long long will overflow.");
+    static_assert((std::is_enum<Enum>::value), "CppFlags is only usable on enumeration types.");
+
+    using uint = unsigned int;
+    using ushort = unsigned short;
+
+public:
+    typedef typename std::conditional<
+            std::is_unsigned<typename std::underlying_type<Enum>::type>::value,
+            unsigned int,
+            signed int
+        >::type Int;
+
+    typedef Enum enum_type;
+
+    constexpr inline CppFlags() noexcept : i(0) {}
+    constexpr inline CppFlags(Enum flags) noexcept : i(Int(flags)) {}
+
+    constexpr inline CppFlags(CppFlag flag) noexcept : i(flag) {}
+
+    constexpr inline CppFlags(std::initializer_list<Enum> flags) noexcept
+        : i(initializer_list_helper(flags.begin(), flags.end())) {}
+
+    constexpr inline CppFlags &operator&=(int mask) noexcept { i &= mask; return *this; }
+    constexpr inline CppFlags &operator&=(uint mask) noexcept { i &= mask; return *this; }
+    constexpr inline CppFlags &operator&=(Enum mask) noexcept { i &= Int(mask); return *this; }
+    constexpr inline CppFlags &operator|=(CppFlags other) noexcept { i |= other.i; return *this; }
+    constexpr inline CppFlags &operator|=(Enum other) noexcept { i |= Int(other); return *this; }
+    constexpr inline CppFlags &operator^=(CppFlags other) noexcept { i ^= other.i; return *this; }
+    constexpr inline CppFlags &operator^=(Enum other) noexcept { i ^= Int(other); return *this; }
+
+    constexpr inline operator Int() const noexcept { return i; }
+
+    constexpr inline CppFlags operator|(CppFlags other) const noexcept { return CppFlags(CppFlag(i | other.i)); }
+    constexpr inline CppFlags operator|(Enum other) const noexcept { return CppFlags(CppFlag(i | Int(other))); }
+    constexpr inline CppFlags operator^(CppFlags other) const noexcept { return CppFlags(CppFlag(i ^ other.i)); }
+    constexpr inline CppFlags operator^(Enum other) const noexcept { return CppFlags(CppFlag(i ^ Int(other))); }
+    constexpr inline CppFlags operator&(int mask) const noexcept { return CppFlags(CppFlag(i & mask)); }
+    constexpr inline CppFlags operator&(uint mask) const noexcept { return CppFlags(CppFlag(i & mask)); }
+    constexpr inline CppFlags operator&(Enum other) const noexcept { return CppFlags(CppFlag(i & Int(other))); }
+    constexpr inline CppFlags operator~() const noexcept { return CppFlags(CppFlag(~i)); }
+
+    constexpr inline bool operator!() const noexcept { return !i; }
+
+    constexpr inline bool testFlag(Enum flag) const noexcept { return (i & Int(flag)) == Int(flag) && (Int(flag) != 0 || i == Int(flag) ); }
+    constexpr inline CppFlags &setFlag(Enum flag, bool on = true) noexcept
+    {
+        return on ? (*this |= flag) : (*this &= ~Int(flag));
+    }
+
+private:
+    constexpr static inline Int initializer_list_helper(typename std::initializer_list<Enum>::const_iterator it,
+                                                               typename std::initializer_list<Enum>::const_iterator end)
+    noexcept
+    {
+        return (it == end ? Int(0) : (Int(*it) | initializer_list_helper(it + 1, end)));
+    }
+
+    Int i;
+};
+
+class CppIncompatibleFlag
+{
+    int i;
+public:
+    constexpr inline explicit CppIncompatibleFlag(int i) noexcept;
+    constexpr inline operator int() const noexcept { return i; }
+};
+
+constexpr inline CppIncompatibleFlag::CppIncompatibleFlag(int value) noexcept : i(value) {}
+} // namespace cpputils
+
+#define CPP_DECLARE_FLAGS(Flags, Enum)\
+typedef ::cpputils::CppFlags<Enum> Flags;
+
+#define CPP_DECLARE_INCOMPATIBLE_FLAGS(Flags) \
+constexpr inline ::cpputils::CppIncompatibleFlag operator|(Flags::enum_type f1, int f2) noexcept \
+{ return ::cpputils::CppIncompatibleFlag(int(f1) | f2); }
+
+#define CPP_DECLARE_OPERATORS_FOR_FLAGS(Flags) \
+constexpr inline ::cpputils::CppFlags<Flags::enum_type> operator|(Flags::enum_type f1, Flags::enum_type f2) noexcept \
+{ return ::cpputils::CppFlags<Flags::enum_type>(f1) | f2; } \
+constexpr inline ::cpputils::CppFlags<Flags::enum_type> operator|(Flags::enum_type f1, ::cpputils::CppFlags<Flags::enum_type> f2) noexcept \
+{ return f2 | f1; } CPP_DECLARE_INCOMPATIBLE_FLAGS(Flags)