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Add stringification support to std::exception and deriving classes

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This support is based on overriden `std::exception::what` method, so
if an exception does not do so meaningfully, the message is still
pointless.

This is only used as a fallback, both `StringMaker` specialization and
`operator<<` overload have priority..
This commit is contained in:
Martin Hořeňovský
2018-05-12 17:46:25 +02:00
parent c323658483
commit 6c5c4c43a0
7 changed files with 147 additions and 26 deletions
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17
include/internal/catch_tostring.h
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@@ -62,7 +62,9 @@ namespace Catch {
std::string convertUnknownEnumToString( E e );
template<typename T>
typename std::enable_if<!std::is_enum<T>::value, std::string>::type convertUnstreamable( T const& value ) {
typename std::enable_if<
!std::is_enum<T>::value && !std::is_base_of<std::exception, T>::value,
std::string>::type convertUnstreamable( T const& value ) {
#if !defined(CATCH_CONFIG_FALLBACK_STRINGIFIER)
(void)value;
return Detail::unprintableString;
@@ -71,11 +73,20 @@ namespace Catch {
#endif
}
template<typename T>
typename std::enable_if<std::is_enum<T>::value, std::string>::type convertUnstreamable( T const& value ) {
return convertUnknownEnumToString( value );
typename std::enable_if<
!std::is_enum<T>::value && std::is_base_of<std::exception, T>::value,
std::string>::type convertUnstreamable(T const& ex) {
return ex.what();
}
template<typename T>
typename std::enable_if<
std::is_enum<T>::value
, std::string>::type convertUnstreamable( T const& value ) {
return convertUnknownEnumToString( value );
}
#if defined(_MANAGED)
//! Convert a CLR string to a utf8 std::string
template<typename T>