Hello,
I have a piece of code that works perfectly with recent versions of g++ but
fails to compile with clang++. I try to understand why.
ScalarOperations.h:
template<typename Type>
typename utils::EnableIf<(not IsVector<Type>::value),
bool
>::Type smallerEquals (
Type lhs,
Type rhs,
Type tolerance = NUMERICAL_ZERO_DIFFERENCE);
ScalarOperations.cpph:
template<typename Type>
inline
typename utils::EnableIf<not IsVector<Type>::value,
bool
>::Type smallerEquals (
Type lhs,
Type rhs,
Type tolerance
) {
return lhs - rhs <= tolerance;
}
this is called from ScalarTest.cpp like that:
#include "code.h"
double a = 1.0;
double b = 2.0;
double eps = 1e-14;
validate (smallerEquals(a, b, eps));
That fails with:
clang++ -o build/debug/tarch/la/tests/ScalarTest.o -c -fPIC -g3 -O0 -DDebug
-DAsserts -Isrc -Isrc -I/usr/include/openmpi -I/usr/include -
I/usr/include/python2.7 -I/usr/include/python2.7/numpy
src/tarch/la/tests/ScalarTest.cpp
src/tarch/la/tests/ScalarTest.cpp:53:13: error: call to 'smallerEquals' is
ambiguous
validate (smallerEquals(a, b, eps));
^~~~~~~~~~~~~
src/tarch/tests/TestMacros.h:45:37: note: expanded from macro 'validate'
#define validate(booleanExpr) if (!(booleanExpr)) { \
^
src/tarch/la/ScalarOperations.h:77:13: note: candidate function [with Type =
double]
>::Type smallerEquals (
^
src/tarch/la/ScalarOperations.cpph:79:9: note: candidate function [with Type
= double]
>::Type smallerEquals (
^
Lines 77 resp. 79 are the lines I posted above. If I delete the code in the
CPPH file it compiles fine but fails at linking (of course).
What is the problem here?
Thanks,
Florian
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