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GCC-5 compatibility: ambiguity in overload resolution

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we have a catch-all template operator to get a string converted
or pretty printed output from "any object". Unfortunately
this overload counts equivalent to another overload by
the IO manipulators. Solution is to define both operarators
similar in the first argument, thus turing the overload
for the IO manipulators into the more specific overload
due to the explicitly given second argument
This commit is contained in:
Fischlurch 2017-05-01 23:44:37 +02:00
parent 37cdfaba54
commit d29e4e2d6f
1 changed files with 6 additions and 6 deletions
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12
src/lib/format-cout.hpp
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@ -76,9 +76,9 @@ namespace std {
/** generic overload to use custom string conversions in output */
template<typename X, typename = enable_StringConversion<X>>
ostream&
operator<< (ostream& os, X const& obj)
template<typename _CharT, typename _Traits, typename X, typename = enable_StringConversion<X>>
inline basic_ostream<_CharT, _Traits>&
operator<< (basic_ostream<_CharT, _Traits>& os, X const& obj)
{
return os << util::StringConv<X>::invoke (obj);
}
@ -88,9 +88,9 @@ namespace std {
* @note possibly also invokes custom string conversion,
* in case the pointee defines one
*/
template<typename X, typename = enable_StringConversion<X>>
ostream&
operator<< (ostream& os, X const* ptr)
template<typename _CharT, typename _Traits, typename X, typename = enable_StringConversion<X>>
inline basic_ostream<_CharT, _Traits>&
operator<< (basic_ostream<_CharT, _Traits>& os, X const* ptr)
{
if (ptr)
return util::showAddr(os, ptr) << " ↗" << util::StringConv<X>::invoke (*ptr);