maths: add samesign convenience function

2016-02-03 13:56:40 +11:00 · 2016-02-03 13:56:40 +11:00 · 8022d459e5
commit 8022d459e5
parent e85ffe5160
1 changed files with 9 additions and 0 deletions
--- a/maths.hpp
+++ b/maths.hpp
@ -292,6 +292,15 @@ namespace util {
        return std::signbit (t) ? -1 : 1;
    }

+    //-------------------------------------------------------------------------
+    template <typename T>
+    constexpr
+    bool
+    samesign (T a, T b)
+    {
+        return a < 0 && b < 0 || a > 0 && b > 0;
+    }
+

    ///////////////////////////////////////////////////////////////////////////////
    // factorisation