From e9b1c2fed092c9952464cc7999bf4a5c27ab250b Mon Sep 17 00:00:00 2001
From: YX <yxxinyuan@zju.edu.cn>
Date: Sat, 26 Mar 2022 14:29:32 +0800
Subject: [PATCH] Add `const` to Fl_Image::fail() (PR #415)

---
 FL/Fl_Image.H    | 2 +-
 src/Fl_Image.cxx | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/FL/Fl_Image.H b/FL/Fl_Image.H
index 690239b65..a32b29c4a 100644
--- a/FL/Fl_Image.H
+++ b/FL/Fl_Image.H
@@ -187,7 +187,7 @@ public:
     \see count(), w(), h(), data_w(), data_h(), d(), ld()
    */
   const char * const *data() const {return data_;}
-  int fail();
+  int fail() const;
   /**
     Releases an Fl_Image - the same as '\p delete \p this'.
 
diff --git a/src/Fl_Image.cxx b/src/Fl_Image.cxx
index 69c9727ab..2acca2bcb 100644
--- a/src/Fl_Image.cxx
+++ b/src/Fl_Image.cxx
@@ -175,7 +175,7 @@ void Fl_Image::label(Fl_Menu_Item* m) {
  \return ERR_FILE_ACCESS if there was a file access related error (errno should be set)
  \return ERR_FORMAT if image decoding failed.
  */
-int Fl_Image::fail()
+int Fl_Image::fail() const
 {
     // if no image exists, ld_ may contain a simple error code
     if ( (w_<=0) || (h_<=0) || (d_<=0) ) {