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Make stream state have a default-construction option.

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Start integrating it for the field delimiters.
This commit is contained in:
ADAM David Alan Martin
2023-10-25 03:55:42 -04:00
parent 5e86b58987
commit bacaa9fcee
3 changed files with 49 additions and 6 deletions
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6
IOStreams/StreamState.h
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@ -11,11 +11,11 @@ namespace Alepha::Hydrogen::IOStreams ::detail:: stream_state
{
inline namespace exports
{
template< typename Tag, typename Type >
template< typename Tag, typename Type, auto Default= [] { return Type{}; } >
class StreamState;
}
template< typename Tag, typename Type >
template< typename Tag, typename Type, auto Default >
class exports::StreamState
{
private:
@ -70,7 +70,7 @@ namespace Alepha::Hydrogen::IOStreams ::detail:: stream_state
ios.register_callback( callback, index() );
}
auto *&ptr= get_ptr( ios );
if( not ptr ) ptr= new Type{};
if( not ptr ) ptr= new Type{ Default() };
}
public: