https://llvm.org/bugs/show_bug.cgi?id=24092
Bug ID: 24092
Summary: conversion from 'void ()' to 'const Option<void
(*)()>' is ambiguous
Product: clang
Version: 3.5
Hardware: PC
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
This code snippet could not compile with clang++3.5, but could compile with
clang++3.6 . And I search https://llvm.org/bugs/ , seems could not find any
bugs about this. So why this code snippet could not compile in clang++3.5? g++
don't have this problem. Thank you in advance.
void F() {}
template <typename T>
class Option {
public:
Option(const T &) {}
Option(T &&) {}
template <typename U>
Option(const U &) {}
};
class Fork {
public:
Fork(const Option<void (*)(void)>&) {}
};
int main() {
Fork fork(F);
}
The compile error with clang++3.5
test.cpp:25:13: error: conversion from 'void ()' to 'const Option<void (*)()>'
is ambiguous
Fork fork(F);
^
test.cpp:7:3: note: candidate constructor
Option(const T &) {}
^
test.cpp:9:3: note: candidate constructor
Option(T &&) {}
^
test.cpp:12:3: note: candidate constructor [with U = void ()]
Option(const U &) {}
^
1 error generated.
My clang++ version
clang++ --version
Apple LLVM version 6.0 (clang-600.0.54) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin14.1.0
Thread model: posix
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