http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55101
Bug #: 55101
Summary: Invalid implicit conversion in initialization when
source type is a template argument type
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: [email protected]
ReportedBy: [email protected]
Calling f(b) below implies an implicit call to an explicit conversion operator.
This is fine with for gcc 4.8.0 but illegal for clang 3.1 and 3.2 (trunk).
Notice that gcc complains (as it should) in other similar circumstances.
struct A { };
struct B {
explicit operator int() const { return 1; }
explicit operator A() const { return A(); }
};
template <typename T> void f(T b) { int x = b; }
template <typename T> void g(T b) { A y = b; }
int main() {
B b;
//int x = b; // Error: cannot convert 'B' to 'int' in initialization
f(b); // OK for gcc 4.8.0, despite that 'int x = b;' occurs inside f
// Error for clang 3.1 and 3.2.
//A y = b; // Error: conversion from 'B' to non-scalar type 'A' requested
//g(b); // Error: conversion from 'B' to non-scalar type 'A' requested
}
