From ba2d4743a6b2e44d294651a2b036f3d16b01eb2f Mon Sep 17 00:00:00 2001
From: Xpol Wan <xpolife@gmail.com>
Date: Thu, 26 May 2016 10:05:30 +0800
Subject: [PATCH 1/2] Add implement const version of
 workbook::get_sheet_by_name().

and non const version are based on const version.
---
 source/workbook/workbook.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/source/workbook/workbook.cpp b/source/workbook/workbook.cpp
index d0429714..4319d706 100644
--- a/source/workbook/workbook.cpp
+++ b/source/workbook/workbook.cpp
@@ -93,7 +93,7 @@ workbook::workbook(encoding e) : workbook()
     d_->encoding_ = e;
 }
 
-worksheet workbook::get_sheet_by_name(const std::string &name)
+const worksheet workbook::get_sheet_by_name(const std::string &name) const
 {
     for (auto &impl : d_->worksheets_)
     {
@@ -106,6 +106,11 @@ worksheet workbook::get_sheet_by_name(const std::string &name)
     return worksheet();
 }
 
+worksheet workbook::get_sheet_by_name(const std::string &name)
+{
+	return worksheet(static_cast<const workbook*>(this)->get_sheet_by_name(name));
+}
+
 worksheet workbook::get_sheet_by_index(std::size_t index)
 {
     return worksheet(&d_->worksheets_[index]);

From aaabfe546ae63d575a5a71ca8c4e2492ef87b72d Mon Sep 17 00:00:00 2001
From: Xpol Wan <xpolife@gmail.com>
Date: Thu, 26 May 2016 10:44:35 +0800
Subject: [PATCH 2/2] Add tests for const version of get_sheet_by_name().

---
 source/workbook/tests/test_workbook.hpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/source/workbook/tests/test_workbook.hpp b/source/workbook/tests/test_workbook.hpp
index 6d354b93..e7647d14 100644
--- a/source/workbook/tests/test_workbook.hpp
+++ b/source/workbook/tests/test_workbook.hpp
@@ -76,6 +76,17 @@ public:
         TS_ASSERT_EQUALS(new_sheet, found_sheet);
     }
     
+    void test_get_sheet_by_name_const()
+    {
+        xlnt::workbook wb;
+        auto new_sheet = wb.create_sheet();
+        std::string title = "my sheet";
+        new_sheet.set_title(title);
+        const xlnt::workbook& wbconst = wb;
+        auto found_sheet = wbconst.get_sheet_by_name(title);
+        TS_ASSERT_EQUALS(new_sheet, found_sheet);
+    }
+
     void test_index_operator() // test_getitem
     {
         xlnt::workbook wb;