From: David Wells <wellsd2@rpi.edu>
Date: Sat, 12 Aug 2017 23:23:50 +0000 (-0400)
Subject: Remove DEAL_II_HAVE_ISFINITE.
X-Git-Tag: v9.0.0-rc1~1281^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F4801%2Fhead;p=dealii.git

Remove DEAL_II_HAVE_ISFINITE.

This function is now part of the C++11 standard.
---

diff --git a/cmake/checks/check_01_cxx_features.cmake b/cmake/checks/check_01_cxx_features.cmake
index 877438eaf4..8338513fac 100644
--- a/cmake/checks/check_01_cxx_features.cmake
+++ b/cmake/checks/check_01_cxx_features.cmake
@@ -22,7 +22,6 @@
 #   DEAL_II_WITH_CXX17
 #
 #   DEAL_II_HAVE_CXX11_IS_TRIVIALLY_COPYABLE
-#   DEAL_II_HAVE_ISFINITE
 #   DEAL_II_HAVE_FP_EXCEPTIONS
 #   DEAL_II_HAVE_COMPLEX_OPERATOR_OVERLOADS
 #
@@ -513,13 +512,6 @@ CHECK_CXX_SOURCE_COMPILES(
   "
   DEAL_II_HAVE_CXX11_IS_TRIVIALLY_COPYABLE)
 
-CHECK_CXX_SOURCE_COMPILES(
-  "
-  #include <cmath>
-  int main(){ double d=0; std::isfinite (d); return 0; }
-  "
-  DEAL_II_HAVE_ISFINITE)
-
 
 #
 # Check that we can use feenableexcept through the C++11 header file cfenv:
diff --git a/include/deal.II/base/config.h.in b/include/deal.II/base/config.h.in
index 9127408b7a..1450026e62 100644
--- a/include/deal.II/base/config.h.in
+++ b/include/deal.II/base/config.h.in
@@ -108,7 +108,6 @@
  */
 
 #cmakedefine DEAL_II_HAVE_CXX11_IS_TRIVIALLY_COPYABLE
-#cmakedefine DEAL_II_HAVE_ISFINITE
 #cmakedefine DEAL_II_HAVE_FP_EXCEPTIONS
 #cmakedefine DEAL_II_HAVE_COMPLEX_OPERATOR_OVERLOADS
 #cmakedefine DEAL_II_FALLTHROUGH @DEAL_II_FALLTHROUGH@
diff --git a/include/deal.II/base/numbers.h b/include/deal.II/base/numbers.h
index ded2ddbdeb..572e85975c 100644
--- a/include/deal.II/base/numbers.h
+++ b/include/deal.II/base/numbers.h
@@ -291,16 +291,7 @@ namespace numbers
 
   inline bool is_finite (const double x)
   {
-#ifdef DEAL_II_HAVE_ISFINITE
-    return !std::isnan(x) && std::isfinite (x);
-#else
-    // Check against infinities. Note
-    // that if x is a NaN, then both
-    // comparisons will be false
-    return ((x >= -std::numeric_limits<double>::max())
-            &&
-            (x <= std::numeric_limits<double>::max()));
-#endif
+    return std::isfinite(x);
   }