http://llvm.org/bugs/show_bug.cgi?id=16646
Bug ID: 16646
Summary: clang++ reports substitution failure with incorrect
argument list
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
The following code produces a "substitution failure" in clang++ trunk, although
it seems ok and works as expected in GCC.
---- begin example code ---
#include <iostream>
#include <tuple>
template <typename T> struct DefaultValue { const T value=0;};
template <> struct DefaultValue<std::string> { const std::string
value="Uninitialized";};
template <typename ... Args>
using Zero = std::tuple<DefaultValue<Args> ...>;
template <typename ... Args>
void f(const Zero<Args ...> &t)
{
std::cout << sizeof...(Args) << std::endl;
}
int main()
{
Zero<int,double,double> T;
f(T);
// f<int,double,double>(T); // This works
}
---- end example code ---
The compiler error is :
v1.cc:19:5: error: no matching function for call to 'blaha'
blaha(T);
^~~~~
v1.cc:11:6: note: candidate template ignored: substitution failure [with Args =
<int>]
void f(const Zero<Args ...> &t)
^
1 error generated.
Note the "with Args =<int>" part. When I call f with T, Args should be inferred
as <int, double, double>. Shouldn't it ?
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