Core/ChatCommands: Move Trinity::ChatCommands::Variant from boost::variant to std::variant (for real this time)

5 files changed, 352 insertions, 352 deletions

diff --git a/src/server/game/Chat/ChatCommands/ChatCommandArgs.cpp b/src/server/game/Chat/ChatCommands/ChatCommandArgs.cpp
index 62ed5afc6c2..fb94f6811b3 100644
--- a/src/server/game/Chat/ChatCommands/ChatCommandArgs.cpp
+++ b/src/server/game/Chat/ChatCommands/ChatCommandArgs.cpp
@@ -31,9 +31,9 @@ struct AchievementVisitor
 };
 char const* Trinity::ChatCommands::ArgInfo<AchievementEntry const*>::TryConsume(AchievementEntry const*& data, char const* args)
 {
-    Variant <Hyperlink<achievement>, uint32> val;
+    Variant<Hyperlink<achievement>, uint32> val;
     if ((args = CommandArgsConsumerSingle<decltype(val)>::TryConsumeTo(val, args)))
-        data = boost::apply_visitor(AchievementVisitor(), val);
+        data = val.visit(AchievementVisitor());
     return args;
 }
 
@@ -47,7 +47,7 @@ char const* Trinity::ChatCommands::ArgInfo<GameTele const*>::TryConsume(GameTele
 {
     Variant<Hyperlink<tele>, std::string> val;
     if ((args = CommandArgsConsumerSingle<decltype(val)>::TryConsumeTo(val, args)))
-        data = boost::apply_visitor(GameTeleVisitor(), val);
+        data = val.visit(GameTeleVisitor());
     return args;
 }
 
@@ -61,21 +61,22 @@ char const* Trinity::ChatCommands::ArgInfo<SpellInfo const*>::TryConsume(SpellIn
 {
     Variant<Hyperlink<spell>, uint32> val;
     if ((args = CommandArgsConsumerSingle<decltype(val)>::TryConsumeTo(val, args)))
-        data = boost::apply_visitor(SpellInfoVisitor(), val);
+        data = val.visit(SpellInfoVisitor());
     return args;
 }
 
-struct BoolVisitor
-{
-    using value_type = bool;
-    value_type operator()(uint32 i) const { return !!i; }
-    value_type operator()(ExactSequence<'o', 'n'>) const { return true; }
-    value_type operator()(ExactSequence<'o', 'f', 'f'>) const { return false; }
-};
 char const* Trinity::ChatCommands::ArgInfo<bool>::TryConsume(bool& data, char const* args)
 {
-    Variant<uint32, ExactSequence<'o', 'n'>, ExactSequence<'o', 'f', 'f'>> val;
-    if ((args = CommandArgsConsumerSingle<decltype(val)>::TryConsumeTo(val, args)))
-        data = boost::apply_visitor(BoolVisitor(), val);
+    std::string val;
+    if ((args = CommandArgsConsumerSingle<std::string>::TryConsumeTo(val, args)))
+    {
+        strToLower(val);
+        if (val == "on" || val == "yes" || val == "true" || val == "1" || val == "y")
+            data = true;
+        else if (val == "off" || val == "no" || val == "false" || val == "0" || val == "n")
+            data = false;
+        else
+            return nullptr;
+    }
     return args;
 }
diff --git a/src/server/game/Chat/ChatCommands/ChatCommandArgs.h b/src/server/game/Chat/ChatCommands/ChatCommandArgs.h
index c9e0723fbf8..d7fa5cf65db 100644
--- a/src/server/game/Chat/ChatCommands/ChatCommandArgs.h
+++ b/src/server/game/Chat/ChatCommands/ChatCommandArgs.h
@@ -50,7 +50,7 @@ struct ArgInfo<T, std::enable_if_t<std::is_integral_v<T> && std::is_signed_v<T>>
     static char const* TryConsume(T& val, char const* args)
     {
         char const* next = args;
-        std::string token(args, tokenize(next));
+        std::string token(args, Trinity::Impl::ChatCommands::tokenize(next));
         try
         {
             size_t processedChars = 0;
@@ -70,7 +70,7 @@ struct ArgInfo<T, std::enable_if_t<std::is_integral_v<T> && std::is_unsigned_v<T
     static char const* TryConsume(T& val, char const* args)
     {
         char const* next = args;
-        std::string token(args, tokenize(next));
+        std::string token(args, Trinity::Impl::ChatCommands::tokenize(next));
         try
         {
             size_t processedChars = 0;
@@ -90,7 +90,7 @@ struct ArgInfo<T, std::enable_if_t<std::is_floating_point_v<T>>>
     static char const* TryConsume(T& val, char const* args)
     {
         char const* next = args;
-        std::string token(args, tokenize(next));
+        std::string token(args, Trinity::Impl::ChatCommands::tokenize(next));
         try
         {
             size_t processedChars = 0;
@@ -110,7 +110,7 @@ struct ArgInfo<std::string, void>
     static char const* TryConsume(std::string& val, char const* args)
     {
         char const* next = args;
-        if (size_t len = tokenize(next))
+        if (size_t len = Trinity::Impl::ChatCommands::tokenize(next))
         {
             val.assign(args, len);
             return next;
diff --git a/src/server/game/Chat/ChatCommands/ChatCommandHelpers.h b/src/server/game/Chat/ChatCommands/ChatCommandHelpers.h
index ff9b5a3b8fc..e22823e5d35 100644
--- a/src/server/game/Chat/ChatCommands/ChatCommandHelpers.h
+++ b/src/server/game/Chat/ChatCommands/ChatCommandHelpers.h
@@ -20,58 +20,50 @@
 
 #include <type_traits>
 
-namespace Trinity
-{
-namespace ChatCommands
+namespace Trinity::ChatCommands
 {
+    static constexpr char COMMAND_DELIMITER = ' ';
 
-static constexpr char COMMAND_DELIMITER = ' ';
+    template <typename T, typename = void>
+    struct tag_base
+    {
+        using type = T;
+    };
 
-/***************** HELPERS *************************\
-|* These really aren't for outside use...          *|
-\***************************************************/
-inline std::size_t tokenize(char const*& end)
-{
-    std::size_t len = 0;
-    for (; *end && *end != COMMAND_DELIMITER; ++end, ++len);
-    for (; *end && *end == COMMAND_DELIMITER; ++end);
-    return len;
+    template <typename T>
+    using tag_base_t = typename tag_base<T>::type;
 }
 
-template <typename T, typename = void>
-struct tag_base
+namespace Trinity::Impl::ChatCommands
 {
-    using type = T;
-};
+    /***************** HELPERS *************************\
+    |* These really aren't for outside use...          *|
+    \***************************************************/
+    inline std::size_t tokenize(char const*& end)
+    {
+        std::size_t len = 0;
+        for (; *end && *end != Trinity::ChatCommands::COMMAND_DELIMITER; ++end, ++len);
+        for (; *end && *end == Trinity::ChatCommands::COMMAND_DELIMITER; ++end);
+        return len;
+    }
 
-template <typename T>
-using tag_base_t = typename tag_base<T>::type;
+    template <typename T, typename... Ts>
+    struct are_all_assignable
+    {
+        static constexpr bool value = (std::is_assignable_v<T&, Ts> && ...);
+    };
 
-template <typename...>
-struct are_all_assignable
-{
-    static constexpr bool value = true;
-};
-
-template <typename T1, typename T2, typename... Ts>
-struct are_all_assignable<T1, T2, Ts...>
-{
-    static constexpr bool value = std::is_assignable_v<T1&, T2> && are_all_assignable<T1, Ts...>::value;
-};
+    template <std::size_t index, typename T1, typename... Ts>
+    struct get_nth : get_nth<index-1, Ts...> { };
 
-template <std::size_t index, typename T1, typename... Ts>
-struct get_nth : get_nth<index-1, Ts...> { };
+    template <typename T1, typename... Ts>
+    struct get_nth<0, T1, Ts...>
+    {
+        using type = T1;
+    };
 
-template <typename T1, typename... Ts>
-struct get_nth<0, T1, Ts...>
-{
-    using type = T1;
-};
-
-template <std::size_t index, typename... Ts>
-using get_nth_t = typename get_nth<index, Ts...>::type;
-
-}
+    template <std::size_t index, typename... Ts>
+    using get_nth_t = typename get_nth<index, Ts...>::type;
 }
 
 #endif
diff --git a/src/server/game/Chat/ChatCommands/ChatCommandTags.h b/src/server/game/Chat/ChatCommands/ChatCommandTags.h
index feffc25aa25..ba4f6d5a649 100644
--- a/src/server/game/Chat/ChatCommands/ChatCommandTags.h
+++ b/src/server/game/Chat/ChatCommands/ChatCommandTags.h
@@ -22,150 +22,160 @@
 #include "ChatCommandHelpers.h"
 #include "Hyperlinks.h"
 #include "Optional.h"
-#include <boost/variant.hpp>
 #include <cmath>
 #include <cstring>
+#include <iostream>
 #include <string>
 #include <tuple>
 #include <type_traits>
 #include <utility>
+#include <variant>
 
-namespace Trinity
+namespace Trinity::ChatCommands
 {
-namespace ChatCommands
-{
-/************************** CONTAINER TAGS **********************************************\
-|* Simple holder classes to differentiate between extraction methods                    *|
-|* Should inherit from ContainerTag for template identification                         *|
-|* Must implement the following:                                                        *|
-|* - TryConsume: char const* -> char const*                                             *|
-|*   returns nullptr if no match, otherwise pointer to first character of next token    *|
-|* - typedef value_type of type that is contained within the tag                        *|
-|* - cast operator to value_type                                                        *|
-|*                                                                                      *|
-\****************************************************************************************/
-struct ContainerTag {};
-template <typename T>
-struct tag_base<T, std::enable_if_t<std::is_base_of_v<ContainerTag, T>>>
-{
-    using type = typename T::value_type;
-};
-
-template <char c1, char... chars>
-struct ExactSequence : public ContainerTag
-{
-    using value_type = void;
-
-    static constexpr bool isSingleChar = !sizeof...(chars);
-
-    template <bool C = isSingleChar>
-    static typename std::enable_if_t<!C, char const*> _TryConsume(char const* pos)
+    /************************** CONTAINER TAGS **********************************************\
+    |* Simple holder classes to differentiate between extraction methods                    *|
+    |* Should inherit from ContainerTag for template identification                         *|
+    |* Must implement the following:                                                        *|
+    |* - TryConsume: char const* -> char const*                                             *|
+    |*   returns nullptr if no match, otherwise pointer to first character of next token    *|
+    |* - typedef value_type of type that is contained within the tag                        *|
+    |* - cast operator to value_type                                                        *|
+    |*                                                                                      *|
+    \****************************************************************************************/
+    struct ContainerTag {};
+    template <typename T>
+    struct tag_base<T, std::enable_if_t<std::is_base_of_v<ContainerTag, T>>>
     {
-        if (*(pos++) == c1)
-            return ExactSequence<chars...>::_TryConsume(pos);
-        else
-            return nullptr;
-    }
+        using type = typename T::value_type;
+    };
 
-    template <bool C = isSingleChar>
-    static typename std::enable_if_t<C, char const*> _TryConsume(char const* pos)
+    template <char c1, char... chars>
+    struct ExactSequence : public ContainerTag
     {
-        if (*(pos++) != c1)
-            return nullptr;
-        // if more of string is left, tokenize should return 0 (otherwise we didn't reach end of token yet)
-        return *pos && tokenize(pos) ? nullptr : pos;
-    }
-
-    char const* TryConsume(char const* pos) const { return ExactSequence::_TryConsume(pos); }
-};
-
-template <typename linktag>
-struct Hyperlink : public ContainerTag
-{
-    typedef typename linktag::value_type value_type;
-    typedef advstd::remove_cvref_t<value_type> storage_type;
-
-    public:
-        operator value_type() const { return val; }
-        value_type operator*() const { return val; }
-        storage_type const* operator->() const { return &val; }
+        using value_type = void;
 
-        char const* TryConsume(char const* pos)
+        static char const* _TryConsume(char const* pos)
         {
-            Trinity::Hyperlinks::HyperlinkInfo info = Trinity::Hyperlinks::ParseHyperlink(pos);
-            // invalid hyperlinks cannot be consumed
-            if (!info)
-                return nullptr;
-
-            // check if we got the right tag
-            if (info.tag.second != strlen(linktag::tag()))
-                return nullptr;
-            if (strncmp(info.tag.first, linktag::tag(), strlen(linktag::tag())) != 0)
+            if (*(pos++) == c1)
+            {
+                if constexpr (sizeof...(chars))
+                    return ExactSequence<chars...>::_TryConsume(pos);
+                else if (Trinity::Impl::ChatCommands::tokenize(pos)) /* we did not consume the entire token */
+                    return nullptr;
+                else
+                    return pos;
+            }
+            else
                 return nullptr;
-
-            // store value
-            if (!linktag::StoreTo(val, info.data.first, info.data.second))
-                return nullptr;
-
-            // finally, skip to end of token
-            pos = info.next;
-            tokenize(pos);
-
-            // return final pos
-            return pos;
         }
 
-    private:
-        storage_type val;
-};
+        char const* TryConsume(char const* pos) const { return ExactSequence::_TryConsume(pos); }
+    };
 
-// pull in link tags for user convenience
-using namespace ::Trinity::Hyperlinks::LinkTags;
+    template <typename linktag>
+    struct Hyperlink : public ContainerTag
+    {
+        using value_type = typename linktag::value_type;
+        using storage_type = advstd::remove_cvref_t<value_type>;
+
+        public:
+            operator value_type() const { return val; }
+            value_type operator*() const { return val; }
+            storage_type const* operator->() const { return &val; }
+
+            char const* TryConsume(char const* pos)
+            {
+                Trinity::Hyperlinks::HyperlinkInfo info = Trinity::Hyperlinks::ParseHyperlink(pos);
+                // invalid hyperlinks cannot be consumed
+                if (!info)
+                    return nullptr;
+
+                // check if we got the right tag
+                if (info.tag.second != strlen(linktag::tag()))
+                    return nullptr;
+                if (strncmp(info.tag.first, linktag::tag(), strlen(linktag::tag())) != 0)
+                    return nullptr;
+
+                // store value
+                if (!linktag::StoreTo(val, info.data.first, info.data.second))
+                    return nullptr;
+
+                // finally, skip to end of token
+                pos = info.next;
+                Trinity::Impl::ChatCommands::tokenize(pos);
+
+                // return final pos
+                return pos;
+            }
+
+        private:
+            storage_type val;
+    };
+
+    // pull in link tags for user convenience
+    using namespace ::Trinity::Hyperlinks::LinkTags;
+}
 
 /************************** VARIANT TAG LOGIC *********************************\
 |* This has some special handling over in ChatCommand.h                       *|
 \******************************************************************************/
 
-template <typename T>
-struct CastToVisitor {
-    using result_type = T;
-
-    template <typename U>
-    T operator()(U const& v) const { return v; }
-};
-
-template <typename T1, typename... Ts>
-struct Variant : public boost::variant<T1, Ts...>
+namespace Trinity::Impl
 {
-    using first_type = tag_base_t<T1>;
-    static constexpr bool have_operators = are_all_assignable<first_type, tag_base_t<Ts>...>::value;
+    template <typename T>
+    struct CastToVisitor {
+        template <typename U>
+        T operator()(U const& v) const { return v; }
+    };
+}
 
-    template <bool C = have_operators>
-    operator std::enable_if_t<C, first_type>()
+namespace Trinity::ChatCommands
+{
+    template <typename T1, typename... Ts>
+    struct Variant : public std::variant<T1, Ts...>
     {
-        return operator*();
-    }
+        using base = std::variant<T1, Ts...>;
 
-    template <bool C = have_operators>
-    std::enable_if_t<C, first_type> operator*()
-    {
-        return boost::apply_visitor(CastToVisitor<first_type>(), *this);
-    }
+        using first_type = tag_base_t<T1>;
+        static constexpr bool have_operators = Trinity::Impl::ChatCommands::are_all_assignable<first_type, tag_base_t<Ts>...>::value;
 
-    template <bool C = have_operators>
-    std::enable_if_t<C, first_type const&> operator*() const
-    {
-        return boost::apply_visitor(CastToVisitor<first_type const&>(), *this);
-    }
+        template <bool C = have_operators>
+        std::enable_if_t<C, first_type> operator*() const
+        {
+            return visit(Trinity::Impl::CastToVisitor<first_type>());
+        }
 
-    template <typename T>
-    Variant& operator=(T&& arg) { boost::variant<T1, Ts...>::operator=(std::forward<T>(arg)); return *this; }
+        template <bool C = have_operators>
+        operator std::enable_if_t<C, first_type>() const
+        {
+            return operator*();
+        }
+
+        template <typename T>
+        Variant& operator=(T&& arg) { base::operator=(std::forward<T>(arg)); return *this; }
 
-    template <size_t index>
-    decltype(auto) get() const { return boost::get<get_nth_t<index, T1, Ts...>>(*this); }
-};
+        template <size_t index>
+        constexpr decltype(auto) get() { return std::get<index>(static_cast<base const&>(*this)); }
+        template <size_t index>
+        constexpr decltype(auto) get() const { return std::get<index>(static_cast<base const&>(*this)); }
 
+        template <typename T>
+        constexpr decltype(auto) visit(T&& arg) const { return std::visit(std::forward<T>(arg), static_cast<base const&>(*this)); }
+
+        template <typename T>
+        constexpr bool holds_alternative() const { return std::holds_alternative<T>(static_cast<base const&>(*this)); }
+    };
 }
+
+/* make the correct operator<< to use explicit, because otherwise the compiler gets confused with the implicit std::variant conversion */
+namespace std
+{
+    template <typename... Ts>
+    auto operator<<(std::ostream& os, Trinity::ChatCommands::Variant<Ts...> const& v) -> std::enable_if_t<Trinity::ChatCommands::Variant<Ts...>::have_operators, std::ostream&>
+    {
+        return (os << *v);
+    }
 }
 
 #endif
diff --git a/src/server/game/Chat/Hyperlinks.h b/src/server/game/Chat/Hyperlinks.h
index 58d5816c6d3..b1b43b69a07 100644
--- a/src/server/game/Chat/Hyperlinks.h
+++ b/src/server/game/Chat/Hyperlinks.h
@@ -31,212 +31,209 @@ class SpellInfo;
 class Quest;
 struct TalentEntry;
 
-namespace Trinity
+namespace Trinity::Hyperlinks
 {
-namespace Hyperlinks
-{
-
-struct AchievementLinkData
-{
-    AchievementEntry const* Achievement;
-    ObjectGuid::LowType CharacterId;
-    bool IsFinished;
-    uint16 Year;
-    uint8 Month;
-    uint8 Day;
-    uint32 Criteria[4];
-};
-
-struct GlyphLinkData
-{
-    GlyphPropertiesEntry const* Glyph;
-    GlyphSlotEntry const* Slot;
-};
-
-struct ItemLinkData
-{
-    ItemTemplate const* Item;
-    uint32 EnchantId;
-    uint32 GemEnchantId[3];
-    int32 RandomPropertyId;
-    int32 RandomPropertySeed;
-    uint8 RenderLevel;
-};
-
-struct QuestLinkData
-{
-    ::Quest const* Quest;
-    uint8 QuestLevel;
-};
 
-struct TalentLinkData
-{
-    TalentEntry const* Talent;
-    uint8 Rank;
-};
-
-struct TradeskillLinkData
-{
-    SpellInfo const* Spell;
-    uint16 CurValue;
-    uint16 MaxValue;
-    ObjectGuid Owner;
-    std::string KnownRecipes;
-};
-
-namespace LinkTags {
-
-    /************************** LINK TAGS ***************************************************\
-    |* Link tags must abide by the following:                                               *|
-    |* - MUST expose ::value_type typedef                                                   *|
-    |*   - storage type is remove_cvref_t<value_type>                                       *|
-    |* - MUST expose static ::tag method, void -> const char*                               *|
-    |*   - this method SHOULD be constexpr                                                  *|
-    |*   - returns identifier string for the link ("creature", "creature_entry", "item")    *|
-    |* - MUST expose static ::StoreTo method, (storage&, char const*, size_t)               *|
-    |*   - assign value_type& based on content of std::string(char const*, size_t)          *|
-    |*   - return value indicates success/failure                                           *|
-    |*   - for integral/string types this can be achieved by extending base_tag             *|
-    \****************************************************************************************/
-    struct base_tag
+    struct AchievementLinkData
     {
-        static bool StoreTo(std::string& val, char const* pos, size_t len)
-        {
-            val.assign(pos, len);
-            return true;
-        }
-
-        template <typename T>
-        static std::enable_if_t<std::is_integral_v<T> && std::is_unsigned_v<T>, bool> StoreTo(T& val, char const* pos, size_t len)
-        {
-            try { val = std::stoull(std::string(pos, len)); }
-            catch (...) { return false; }
-            return true;
-        }
-
-        template <typename T>
-        static std::enable_if_t<std::is_integral_v<T> && std::is_signed_v<T>, bool> StoreTo(T& val, char const* pos, size_t len)
-        {
-            try { val = std::stoll(std::string(pos, len)); }
-            catch (...) { return false; }
-            return true;
-        }
-
-        static bool StoreTo(ObjectGuid& val, char const* pos, size_t len)
-        {
-            try { val.Set(std::stoul(std::string(pos, len), nullptr, 16)); }
-            catch (...) { return false; }
-            return true;
-        }
+        AchievementEntry const* Achievement;
+        ObjectGuid::LowType CharacterId;
+        bool IsFinished;
+        uint16 Year;
+        uint8 Month;
+        uint8 Day;
+        uint32 Criteria[4];
     };
 
-#define make_base_tag(ltag, type) struct ltag : public base_tag { using value_type = type; static constexpr char const* tag() { return #ltag; } }
-    make_base_tag(area, uint32);
-    make_base_tag(areatrigger, uint32);
-    make_base_tag(creature, ObjectGuid::LowType);
-    make_base_tag(creature_entry, uint32);
-    make_base_tag(gameevent, uint32);
-    make_base_tag(gameobject, ObjectGuid::LowType);
-    make_base_tag(gameobject_entry, uint32);
-    make_base_tag(itemset, uint32);
-    make_base_tag(player, std::string const&);
-    make_base_tag(skill, uint32);
-    make_base_tag(taxinode, uint32);
-    make_base_tag(tele, uint32);
-    make_base_tag(title, uint32);
-#undef make_base_tag
-
-    struct TC_GAME_API achievement
+    struct GlyphLinkData
     {
-        using value_type = AchievementLinkData const&;
-        static constexpr char const* tag() { return "achievement"; }
-        static bool StoreTo(AchievementLinkData& val, char const* pos, size_t len);
+        GlyphPropertiesEntry const* Glyph;
+        GlyphSlotEntry const* Slot;
     };
 
-    struct TC_GAME_API enchant
+    struct ItemLinkData
     {
-        using value_type = SpellInfo const*;
-        static constexpr char const* tag() { return "enchant"; }
-        static bool StoreTo(SpellInfo const*& val, char const* pos, size_t len);
+        ItemTemplate const* Item;
+        uint32 EnchantId;
+        uint32 GemEnchantId[3];
+        int32 RandomPropertyId;
+        int32 RandomPropertySeed;
+        uint8 RenderLevel;
     };
 
-    struct TC_GAME_API glyph
+    struct QuestLinkData
     {
-        using value_type = GlyphLinkData const&;
-        static constexpr char const* tag() { return "glyph"; };
-        static bool StoreTo(GlyphLinkData& val, char const* pos, size_t len);
+        ::Quest const* Quest;
+        uint8 QuestLevel;
     };
 
-    struct TC_GAME_API item
+    struct TalentLinkData
     {
-        using value_type = ItemLinkData const&;
-        static constexpr char const* tag() { return "item"; }
-        static bool StoreTo(ItemLinkData& val, char const* pos, size_t len);
+        TalentEntry const* Talent;
+        uint8 Rank;
     };
 
-    struct TC_GAME_API quest
+    struct TradeskillLinkData
     {
-        using value_type = QuestLinkData const&;
-        static constexpr char const* tag() { return "quest"; }
-        static bool StoreTo(QuestLinkData& val, char const* pos, size_t len);
+        SpellInfo const* Spell;
+        uint16 CurValue;
+        uint16 MaxValue;
+        ObjectGuid Owner;
+        std::string KnownRecipes;
     };
 
-    struct TC_GAME_API spell
-    {
-        using value_type = SpellInfo const*;
-        static constexpr char const* tag() { return "spell"; }
-        static bool StoreTo(SpellInfo const*& val, char const* pos, size_t len);
-    };
+    namespace LinkTags {
+
+        /************************** LINK TAGS ***************************************************\
+        |* Link tags must abide by the following:                                               *|
+        |* - MUST expose ::value_type typedef                                                   *|
+        |*   - storage type is remove_cvref_t<value_type>                                       *|
+        |* - MUST expose static ::tag method, void -> const char*                               *|
+        |*   - this method SHOULD be constexpr                                                  *|
+        |*   - returns identifier string for the link ("creature", "creature_entry", "item")    *|
+        |* - MUST expose static ::StoreTo method, (storage&, char const*, size_t)               *|
+        |*   - assign value_type& based on content of std::string(char const*, size_t)          *|
+        |*   - return value indicates success/failure                                           *|
+        |*   - for integral/string types this can be achieved by extending base_tag             *|
+        \****************************************************************************************/
+        struct base_tag
+        {
+            static bool StoreTo(std::string& val, char const* pos, size_t len)
+            {
+                val.assign(pos, len);
+                return true;
+            }
+
+            template <typename T>
+            static std::enable_if_t<std::is_integral_v<T> && std::is_unsigned_v<T>, bool> StoreTo(T& val, char const* pos, size_t len)
+            {
+                try { val = std::stoull(std::string(pos, len)); }
+                catch (...) { return false; }
+                return true;
+            }
+
+            template <typename T>
+            static std::enable_if_t<std::is_integral_v<T> && std::is_signed_v<T>, bool> StoreTo(T& val, char const* pos, size_t len)
+            {
+                try { val = std::stoll(std::string(pos, len)); }
+                catch (...) { return false; }
+                return true;
+            }
+
+            static bool StoreTo(ObjectGuid& val, char const* pos, size_t len)
+            {
+                try { val.Set(std::stoul(std::string(pos, len), nullptr, 16)); }
+                catch (...) { return false; }
+                return true;
+            }
+        };
+
+    #define make_base_tag(ltag, type) struct ltag : public base_tag { using value_type = type; static constexpr char const* tag() { return #ltag; } }
+        make_base_tag(area, uint32);
+        make_base_tag(areatrigger, uint32);
+        make_base_tag(creature, ObjectGuid::LowType);
+        make_base_tag(creature_entry, uint32);
+        make_base_tag(gameevent, uint32);
+        make_base_tag(gameobject, ObjectGuid::LowType);
+        make_base_tag(gameobject_entry, uint32);
+        make_base_tag(itemset, uint32);
+        make_base_tag(player, std::string const&);
+        make_base_tag(skill, uint32);
+        make_base_tag(taxinode, uint32);
+        make_base_tag(tele, uint32);
+        make_base_tag(title, uint32);
+    #undef make_base_tag
+
+        struct TC_GAME_API achievement
+        {
+            using value_type = AchievementLinkData const&;
+            static constexpr char const* tag() { return "achievement"; }
+            static bool StoreTo(AchievementLinkData& val, char const* pos, size_t len);
+        };
 
-    struct TC_GAME_API talent
-    {
-        using value_type = TalentLinkData const&;
-        static constexpr char const* tag() { return "talent"; }
-        static bool StoreTo(TalentLinkData& val, char const* pos, size_t len);
-    };
+        struct TC_GAME_API enchant
+        {
+            using value_type = SpellInfo const*;
+            static constexpr char const* tag() { return "enchant"; }
+            static bool StoreTo(SpellInfo const*& val, char const* pos, size_t len);
+        };
+
+        struct TC_GAME_API glyph
+        {
+            using value_type = GlyphLinkData const&;
+            static constexpr char const* tag() { return "glyph"; };
+            static bool StoreTo(GlyphLinkData& val, char const* pos, size_t len);
+        };
+
+        struct TC_GAME_API item
+        {
+            using value_type = ItemLinkData const&;
+            static constexpr char const* tag() { return "item"; }
+            static bool StoreTo(ItemLinkData& val, char const* pos, size_t len);
+        };
+
+        struct TC_GAME_API quest
+        {
+            using value_type = QuestLinkData const&;
+            static constexpr char const* tag() { return "quest"; }
+            static bool StoreTo(QuestLinkData& val, char const* pos, size_t len);
+        };
+
+        struct TC_GAME_API spell
+        {
+            using value_type = SpellInfo const*;
+            static constexpr char const* tag() { return "spell"; }
+            static bool StoreTo(SpellInfo const*& val, char const* pos, size_t len);
+        };
+
+        struct TC_GAME_API talent
+        {
+            using value_type = TalentLinkData const&;
+            static constexpr char const* tag() { return "talent"; }
+            static bool StoreTo(TalentLinkData& val, char const* pos, size_t len);
+        };
 
-    struct TC_GAME_API trade
+        struct TC_GAME_API trade
+        {
+            using value_type = TradeskillLinkData const&;
+            static constexpr char const* tag() { return "trade"; }
+            static bool StoreTo(TradeskillLinkData& val, char const* pos, size_t len);
+        };
+    }
+
+    struct HyperlinkColor
     {
-        using value_type = TradeskillLinkData const&;
-        static constexpr char const* tag() { return "trade"; }
-        static bool StoreTo(TradeskillLinkData& val, char const* pos, size_t len);
+        HyperlinkColor(uint32 c) : r(c >> 16), g(c >> 8), b(c), a(c >> 24) {}
+        uint8 r, g, b, a;
+        bool operator==(uint32 c) const
+        {
+            if ((c & 0xff) ^ b)
+                return false;
+            if (((c >>= 8) & 0xff) ^ g)
+                return false;
+            if (((c >>= 8) & 0xff) ^ r)
+                return false;
+            if ((c >>= 8) ^ a)
+                return false;
+            return true;
+        }
     };
-}
 
-struct HyperlinkColor
-{
-    HyperlinkColor(uint32 c) : r(c >> 16), g(c >> 8), b(c), a(c >> 24) {}
-    uint8 r, g, b, a;
-    bool operator==(uint32 c) const
+    struct HyperlinkInfo
     {
-        if ((c & 0xff) ^ b)
-            return false;
-        if (((c >>= 8) & 0xff) ^ g)
-            return false;
-        if (((c >>= 8) & 0xff) ^ r)
-            return false;
-        if ((c >>= 8) ^ a)
-            return false;
-        return true;
-    }
-};
-
-struct HyperlinkInfo
-{
-    HyperlinkInfo(char const* n = nullptr, uint32 c = 0, char const* tS = nullptr, size_t tL = 0, char const* dS = nullptr, size_t dL = 0, char const* cS = nullptr, size_t cL = 0) :
-        next(n), color(c), tag(tS, tL), data(dS, dL), text(cS, cL) {}
-
-    explicit operator bool() { return next; }
-    char const* const next;
-    HyperlinkColor const color;
-    std::pair<char const*, size_t> const tag;
-    std::pair<char const*, size_t> const data;
-    std::pair<char const*, size_t> const text;
-};
-HyperlinkInfo TC_GAME_API ParseHyperlink(char const* pos);
-bool TC_GAME_API CheckAllLinks(std::string const&);
+        HyperlinkInfo(char const* n = nullptr, uint32 c = 0, char const* tS = nullptr, size_t tL = 0, char const* dS = nullptr, size_t dL = 0, char const* cS = nullptr, size_t cL = 0) :
+            next(n), color(c), tag(tS, tL), data(dS, dL), text(cS, cL) {}
+
+        explicit operator bool() { return next; }
+        char const* const next;
+        HyperlinkColor const color;
+        std::pair<char const*, size_t> const tag;
+        std::pair<char const*, size_t> const data;
+        std::pair<char const*, size_t> const text;
+    };
+    HyperlinkInfo TC_GAME_API ParseHyperlink(char const* pos);
+    bool TC_GAME_API CheckAllLinks(std::string const&);
 
 }
-}
 
 #endif