Sig constraints for approxEqual.

dlang · Jan 16, 2018 · fcae11f · fcae11f
1 parent 58b1f5d
commit fcae11f
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/std/math.d b/std/math.d
@@ -136,6 +136,7 @@ version (Win64)
 static import core.math;
 static import core.stdc.math;
 static import core.stdc.fenv;
+import std.range.primitives : isInputRange, ElementType;
 import std.traits; // CommonType, isFloatingPoint, isIntegral, isSigned, isUnsigned, Largest, Unqual
 
 version(LDC)
@@ -7524,6 +7525,9 @@ private real polyImpl(real x, in real[] A) @trusted pure nothrow @nogc
        pair of elements.
  */
 bool approxEqual(T, U, V)(T lhs, U rhs, V maxRelDiff, V maxAbsDiff = 1e-5)
+    if ((isNumeric!T || (isInputRange!T && isNumeric!(ElementType!T))) &&
+        (isNumeric!U || (isInputRange!U && isNumeric!(ElementType!U))) &&
+        isNumeric!V)
 {
     import std.range.primitives : empty, front, isInputRange, popFront;
     static if (isInputRange!T)