Remove some compiler warnings

Author: flexferrum

include/jinja2cpp/value.h

@@ -62,7 +62,7 @@ class ReflectedList
     {
     }
 
-    bool GetSize() const
+    size_t GetSize() const
     {
         return m_accessor()->GetSize();
     }

src/statements.cpp

@@ -32,13 +32,13 @@ void ForStatement::Render(OutStream& os, RenderContext& values)
         loopVar["first"] = Value(itemIdx == 0);
         loopVar["last"] = Value(itemIdx == itemsNum - 1);
         if (itemIdx != 0)
-            loopVar["previtem"] = (*loopItems)[itemIdx - 1];
+            loopVar["previtem"] = (*loopItems)[static_cast<size_t>(itemIdx - 1)];
         if (itemIdx != itemsNum - 1)
-            loopVar["nextitem"] = (*loopItems)[itemIdx + 1];
+            loopVar["nextitem"] = (*loopItems)[static_cast<size_t>(itemIdx + 1)];
         else
             loopVar.erase("nextitem");
 
-        auto& curValue = (*loopItems)[itemIdx];
+        auto& curValue = (*loopItems)[static_cast<size_t>(itemIdx)];
         if (m_vars.size() > 1 && curValue.isMap())
         {
             for (auto& varName : m_vars)

src/template_parser.h

@@ -274,7 +274,7 @@ class TemplateParser : public LexerHelper
     {
         auto& match = *curMatch;
         int matchType = RM_Unknown;
-        for (int idx = 1; idx < match.size(); ++ idx)
+        for (int idx = 1; idx != match.size(); ++ idx)
         {
             if (match.length(idx) != 0)
             {
@@ -492,7 +492,7 @@ class TemplateParser : public LexerHelper
             return Token::Unknown;
 
         auto& match = *matchBegin;
-        for (int idx = 1; idx < match.size(); ++ idx)
+        for (size_t idx = 1; idx != match.size(); ++ idx)
         {
             if (match.length(idx) != 0)
             {