Changeset 2495:e4f8367beb41 in lemon-0.x

Timestamp:

10/13/07 10:48:07 (17 years ago)

Author:

Akos Ladanyi

Branch:

default

Phase:

public

Convert:

svn:c9d7d8f5-90d6-0310-b91f-818b3a526b0e/lemon/trunk@3334

Message:

Added the function isFinite(), and replaced the calls to finite() with it.
This was necessary because finite() is not a standard function. Neither can
we use its standard counterpart isfinite(), because it was introduced only
in C99, and therefore it is not supplied by all C++ implementations.

File:

• lemon/lp_base.h (modified) (2 diffs)

lemon/lp_base.h

@@ -35 +35 @@
 ///\ingroup lp_group
 namespace lemon {
+
+  /// Function to decide whether a floating point value is finite or not.
+
+  /// Retruns true if the argument is not infinity, minus infinity or NaN.
+  /// It does the same as the isfinite() function defined by C99.
+  template <typename T>
+  bool isFinite(T value)
+  {
+    typedef std::numeric_limits<T> Lim;
+    if (Lim::has_infinity && (value == Lim::infinity() || value ==
+          -Lim::infinity()) ||
+        (Lim::has_quiet_NaN || Lim::has_signaling_NaN) && value != value)
+    {
+      return false;
+    }
+    return true;
+  }
 
   ///Common base class for LP solvers
@@ -458 +475 @@
       ///Is the constraint lower bounded?
       bool lowerBounded() const { 
-        using namespace std;
-        return finite(_lb);
+        return isFinite(_lb);
       }
       ///Is the constraint upper bounded?
       bool upperBounded() const {
-        using namespace std;
-        return finite(_ub);
+        return isFinite(_ub);
       }