From 8693457931a18d7b6e1e7a05362fa59419c8fca6 Mon Sep 17 00:00:00 2001
From: Kurt Schwehr <schwehr@google.com>
Date: Fri, 23 Mar 2018 08:19:37 -0700
Subject: Use pj_is_nan rather than x == x or x != x in pj_apply_vgridshift.c
 (#894)

---
 src/pj_apply_vgridshift.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/pj_apply_vgridshift.c b/src/pj_apply_vgridshift.c
index 1b32c0f6..05803bc8 100644
--- a/src/pj_apply_vgridshift.c
+++ b/src/pj_apply_vgridshift.c
@@ -42,7 +42,7 @@ static double read_vgrid_value( PJ *defn, LP input, int *gridlist_count_p, PJ_GR
     float  *cvs;
     /* do not deal with NaN coordinates */
     /* cppcheck-suppress duplicateExpression */
-    if( input.phi != input.phi || input.lam != input.lam )
+    if( pj_is_nan(input.phi) || pj_is_nan(input.lam) )
         itable = *gridlist_count_p;
 
     /* keep trying till we find a table that works */
-- 
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