Fixed 3nd block of errors

include/xlnt/worksheet/cell_vector.hpp

@@ -176,6 +176,11 @@ public:
     /// </summary>
     const cell operator[](std::size_t column_index) const;
 
+    /// <summary>
+    /// Returns true if this sheet has an initialized cell at the given cell_index.
+    /// </summary>
+    bool has_cell(std::size_t cell_index) const;
+
 private:
     /// <summary>
     /// The worksheet this vector points to cells from

source/utils/time.cpp

@@ -22,6 +22,7 @@
 // @author: see AUTHORS file
 #include <cmath>
 #include <ctime>
+#include <cstdint>
 
 #include <xlnt/utils/time.hpp>
 

source/utils/timedelta.cpp

@@ -22,6 +22,7 @@
 // @author: see AUTHORS file
 #include <cmath>
 #include <ctime>
+#include <cstdint>
 
 #include <xlnt/utils/timedelta.hpp>
 

source/workbook/workbook.cpp

@@ -28,6 +28,8 @@
 #include <functional>
 #include <set>
 
+#include <codecvt>
+
 #include <xlnt/cell/cell.hpp>
 #include <xlnt/packaging/manifest.hpp>
 #include <xlnt/packaging/relationship.hpp>

source/worksheet/cell_vector.cpp

@@ -171,4 +171,9 @@ const cell cell_vector::operator[](std::size_t cell_index) const
     return ws_.cell(cursor_.make_offset(0, static_cast<int>(cell_index)));
 }
 
+bool cell_vector::has_cell(std::size_t cell_index) const
+{
+    return ws_.has_cell(cursor_.make_offset(0, static_cast<int>(cell_index)));
+}
+
 } // namespace xlnt