Everywhere: Stop shoving things into ::std and mentioning them as such

Note that this still keeps the old behaviour of putting things in std by
default on serenity so the tools can be happy, but if USING_AK_GLOBALLY
is unset, AK behaves like a good citizen and doesn't try to put things
in the ::std namespace.

std::nothrow_t and its friends get to stay because I'm being told that
compilers assume things about them and I can't yeet them into a
different namespace...for now.

AK/Atomic.h

@@ -41,7 +41,7 @@ static inline V* atomic_exchange(T volatile** var, V* desired, MemoryOrder order
 }
 
 template<typename T, typename V = RemoveVolatile<T>>
-static inline V* atomic_exchange(T volatile** var, std::nullptr_t, MemoryOrder order = memory_order_seq_cst) noexcept
+static inline V* atomic_exchange(T volatile** var, nullptr_t, MemoryOrder order = memory_order_seq_cst) noexcept
 {
     return __atomic_exchange_n(const_cast<V**>(var), nullptr, order);
 }
@@ -63,7 +63,7 @@ template<typename T, typename V = RemoveVolatile<T>>
 }
 
 template<typename T, typename V = RemoveVolatile<T>>
-[[nodiscard]] static inline bool atomic_compare_exchange_strong(T volatile** var, V*& expected, std::nullptr_t, MemoryOrder order = memory_order_seq_cst) noexcept
+[[nodiscard]] static inline bool atomic_compare_exchange_strong(T volatile** var, V*& expected, nullptr_t, MemoryOrder order = memory_order_seq_cst) noexcept
 {
     if (order == memory_order_acq_rel || order == memory_order_release)
         return __atomic_compare_exchange_n(const_cast<V**>(var), &expected, nullptr, false, memory_order_release, memory_order_acquire);
@@ -125,7 +125,7 @@ static inline void atomic_store(T volatile** var, V* desired, MemoryOrder order
 }
 
 template<typename T, typename V = RemoveVolatile<T>>
-static inline void atomic_store(T volatile** var, std::nullptr_t, MemoryOrder order = memory_order_seq_cst) noexcept
+static inline void atomic_store(T volatile** var, nullptr_t, MemoryOrder order = memory_order_seq_cst) noexcept
 {
     __atomic_store_n(const_cast<V**>(var), nullptr, order);
 }

AK/DeprecatedString.h

@@ -250,7 +250,7 @@ public:
         return *this;
     }
 
-    DeprecatedString& operator=(std::nullptr_t)
+    DeprecatedString& operator=(nullptr_t)
     {
         m_impl = nullptr;
         return *this;

AK/Format.h

@@ -544,8 +544,8 @@ struct Formatter<FixedPoint<precision, Underlying>> : StandardFormatter {
 };
 
 template<>
-struct Formatter<std::nullptr_t> : Formatter<FlatPtr> {
-    ErrorOr<void> format(FormatBuilder& builder, std::nullptr_t)
+struct Formatter<nullptr_t> : Formatter<FlatPtr> {
+    ErrorOr<void> format(FormatBuilder& builder, nullptr_t)
     {
         if (m_mode == Mode::Default)
             m_mode = Mode::Pointer;

AK/Function.h

@@ -54,7 +54,7 @@ public:
     using ReturnType = Out;
 
     Function() = default;
-    Function(std::nullptr_t)
+    Function(nullptr_t)
     {
     }
 
@@ -116,7 +116,7 @@ public:
         return *this;
     }
 
-    Function& operator=(std::nullptr_t)
+    Function& operator=(nullptr_t)
     {
         clear();
         return *this;

AK/OwnPtr.h

@@ -97,7 +97,7 @@ public:
 
     OwnPtr& operator=(T* ptr) = delete;
 
-    OwnPtr& operator=(std::nullptr_t)
+    OwnPtr& operator=(nullptr_t)
     {
         clear();
         return *this;

AK/RefPtr.h

@@ -197,7 +197,7 @@ public:
         return *this;
     }
 
-    RefPtr& operator=(std::nullptr_t)
+    RefPtr& operator=(nullptr_t)
     {
         clear();
         return *this;
@@ -256,7 +256,7 @@ public:
 
     ALWAYS_INLINE operator bool() { return !is_null(); }
 
-    bool operator==(std::nullptr_t) const { return is_null(); }
+    bool operator==(nullptr_t) const { return is_null(); }
 
     bool operator==(RefPtr const& other) const { return as_ptr() == other.as_ptr(); }
 

AK/StdLibExtras.h

@@ -34,10 +34,17 @@ requires(AK::Detail::IsIntegral<T>)
 
 }
 
-#ifndef AK_DONT_REPLACE_STD
-namespace std { // NOLINT(cert-dcl58-cpp) Names in std to aid tools
+#if !USING_AK_GLOBALLY
+#    define AK_REPLACED_STD_NAMESPACE AK::replaced_std
+#else
+#    define AK_REPLACED_STD_NAMESPACE std
+#endif
+
+namespace AK_REPLACED_STD_NAMESPACE { // NOLINT(cert-dcl58-cpp) Names in std to aid tools
 
 // NOTE: These are in the "std" namespace since some compilers and static analyzers rely on it.
+//       If USING_AK_GLOBALLY is false, we can't put them in ::std, so we put them in AK::replaced_std instead
+//       The user code should not notice anything unless it explicitly asks for std::stuff, so...don't.
 
 template<typename T>
 constexpr T&& forward(AK::Detail::RemoveReference<T>& param)
@@ -59,20 +66,11 @@ constexpr T&& move(T& arg)
 }
 
 }
-#else
-#    include <utility>
-#endif
 
-#if !USING_AK_GLOBALLY
 namespace AK {
-#endif
-
-using std::forward;
-using std::move;
-
-#if !USING_AK_GLOBALLY
+using AK_REPLACED_STD_NAMESPACE::forward;
+using AK_REPLACED_STD_NAMESPACE::move;
 }
-#endif
 
 namespace AK::Detail {
 template<typename T>
@@ -193,11 +191,13 @@ using AK::array_size;
 using AK::ceil_div;
 using AK::clamp;
 using AK::exchange;
+using AK::forward;
 using AK::is_constant_evaluated;
 using AK::is_power_of_two;
 using AK::max;
 using AK::min;
 using AK::mix;
+using AK::move;
 using AK::RawPtr;
 using AK::round_up_to_power_of_two;
 using AK::swap;

AK/TypedTransfer.h

@@ -25,9 +25,9 @@ public:
 
         for (size_t i = 0; i < count; ++i) {
             if (destination <= source)
-                new (&destination[i]) T(std::move(source[i]));
+                new (&destination[i]) T(AK::move(source[i]));
             else
-                new (&destination[count - i - 1]) T(std::move(source[count - i - 1]));
+                new (&destination[count - i - 1]) T(AK::move(source[count - i - 1]));
         }
     }
 

AK/Types.h

@@ -81,13 +81,13 @@ constexpr u64 TiB = KiB * KiB * KiB * KiB;
 constexpr u64 PiB = KiB * KiB * KiB * KiB * KiB;
 constexpr u64 EiB = KiB * KiB * KiB * KiB * KiB * KiB;
 
-namespace std { // NOLINT(cert-dcl58-cpp) nullptr_t must be in ::std:: for some analysis tools
+namespace AK_REPLACED_STD_NAMESPACE { // NOLINT(cert-dcl58-cpp) nullptr_t must be in ::std:: for some analysis tools
 using nullptr_t = decltype(nullptr);
 }
 
 namespace AK {
 
-using nullptr_t = std::nullptr_t;
+using nullptr_t = AK_REPLACED_STD_NAMESPACE::nullptr_t;
 
 static constexpr FlatPtr explode_byte(u8 b)
 {
@@ -133,6 +133,7 @@ enum MemoryOrder {
 #if USING_AK_GLOBALLY
 using AK::align_down_to;
 using AK::align_up_to;
+using AK::explode_byte;
 using AK::MemoryOrder;
 using AK::nullptr_t;
 using AK::TriState;

AK/WeakPtr.h

@@ -59,7 +59,7 @@ public:
         return *this;
     }
 
-    WeakPtr& operator=(std::nullptr_t)
+    WeakPtr& operator=(nullptr_t)
     {
         clear();
         return *this;