Implement tag_list

2 files changed, 112 insertions, 1 deletions

diff --git a/include/tag_list.h b/include/tag_list.h
index d0b80ebb01..fe5a6818fa 100644
--- a/include/tag_list.h
+++ b/include/tag_list.h
@@ -21,6 +21,8 @@
 #define TAG_LIST_H_INCLUDED
 
 #include "crtp_tag.h"
+#include "value.h"
+#include <typeinfo>
 #include <vector>
 
 namespace nbt
@@ -98,7 +100,7 @@ public:
     ///Returns the number of tags in the list
     size_t size() const;
 
-    ///Erases all tags from the list
+    ///Erases all tags from the list. Preserves the content type.
     void clear();
 
     //Iterators
@@ -117,6 +119,16 @@ private:
     tag_type el_type_;
 };
 
+template<class T, class... Args>
+void tag_list::emplace_back(Args&&... args)
+{
+    if(el_type_ == tag_type::Null) //set content type if undetermined
+        el_type_ = T::type;
+    else if(el_type_ != T::type)
+        throw std::bad_cast();
+    tags.emplace_back(T(std::forward<Args>(args)...));
+}
+
 }
 
 #endif // TAG_LIST_H_INCLUDED
diff --git a/src/tag_list.cpp b/src/tag_list.cpp
new file mode 100644
index 0000000000..2b66889e56
--- /dev/null
+++ b/src/tag_list.cpp
@@ -0,0 +1,99 @@
+/*
+ * libnbt++ - A library for the Minecraft Named Binary Tag format.
+ * Copyright (C) 2013, 2015  ljfa-ag
+ *
+ * This file is part of libnbt++.
+ *
+ * libnbt++ is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * libnbt++ is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with libnbt++.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "tag_list.h"
+
+namespace nbt
+{
+
+tag_list::tag_list():
+    tag_list(tag_type::Null)
+{}
+
+tag_list::tag_list(tag_type type):
+    el_type_(type)
+{}
+
+value& tag_list::at(size_t i)
+{
+    return tags.at(i);
+}
+
+const value& tag_list::at(size_t i) const
+{
+    return tags.at(i);
+}
+
+value& tag_list::operator[](size_t i)
+{
+    return tags[i];
+}
+
+const value& tag_list::operator[](size_t i) const
+{
+    return tags[i];
+}
+
+void tag_list::set(size_t i, value&& val)
+{
+    if(val.get_type() != el_type_)
+        throw std::bad_cast();
+    tags.at(i) = std::move(val);
+}
+
+void tag_list::push_back(value&& val)
+{
+    if(!val) //don't allow null values
+        throw std::bad_cast();
+    if(el_type_ == tag_type::Null) //set content type if undetermined
+        el_type_ = val.get_type();
+    else if(el_type_ != val.get_type())
+        throw std::bad_cast();
+    tags.push_back(std::move(val));
+}
+
+void tag_list::pop_back()
+{
+    tags.pop_back();
+}
+
+tag_type tag_list::el_type() const
+{
+    return el_type_;
+}
+
+size_t tag_list::size() const
+{
+    return tags.size();
+}
+
+void tag_list::clear()
+{
+    tags.clear();
+}
+
+auto tag_list::begin() -> iterator { return tags.begin(); }
+auto tag_list::end()   -> iterator { return tags.end(); }
+auto tag_list::begin() const  -> const_iterator { return tags.begin(); }
+auto tag_list::end() const    -> const_iterator { return tags.end(); }
+auto tag_list::cbegin() const -> const_iterator { return tags.cbegin(); }
+auto tag_list::cend() const   -> const_iterator { return tags.cend(); }
+
+}
+