[LLVMbugs] [Bug 22707] New: std::isfinite() does not accept convertible-to-double

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Thu Feb 26 05:57:01 PST 2015


            Bug ID: 22707
           Summary: std::isfinite() does not accept convertible-to-double
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: eugeni.stepanov at gmail.com
                CC: llvmbugs at cs.uiuc.edu, mclow.lists at gmail.com
    Classification: Unclassified

#include <cmath>

struct A {
  A(double x) : x(x) {}
  operator double() const { return x; }

  double x;

A a(1.0);
bool z = std::isfinite(a);

error: no matching function for call to 'isfinite'
bool z = std::isfinite(a);
/code/llvm/build/bin/../include/c++/v1/cmath:376:25: note: candidate template
ignored: disabled by 'enable_if' [with _A1 = A]
typename std::enable_if<std::is_arithmetic<_A1>::value, bool>::type

The Standard requires an overload of
 bool isfinite(double x);

Instead, libc++ provides a template implementation with a SFINAE checking for
an arithmetic type.

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