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Simplify the delimiters

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This commit is contained in:
ADAM David Alan Martin
2023-10-31 02:17:27 -04:00
parent 4a74921cb8
commit bb51660272
6 changed files with 64 additions and 145 deletions
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39
IOStreams/StreamState.h
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@ -11,7 +11,7 @@ namespace Alepha::Hydrogen::IOStreams ::detail:: stream_state
{
inline namespace exports
{
template< typename Tag, typename Type, auto Default= [] { return Type{}; } >
template< typename >
class StreamState;
}
@ -20,7 +20,14 @@ namespace Alepha::Hydrogen::IOStreams ::detail:: stream_state
{
private:
const int index= std::ios::xalloc();
std::function< Type () > build;
public:
explicit
StreamState( const std::function< Type () > build )
: build( build ) {}
private:
static Type *&
get_ptr( std::ios_base &ios, const int idx )
{
@ -30,7 +37,7 @@ namespace Alepha::Hydrogen::IOStreams ::detail:: stream_state
Type *&
get_ptr( std::ios_base &ios )
{
get_ptr( ios, index );
return get_ptr( ios, index );
}
static void
@ -50,7 +57,7 @@ namespace Alepha::Hydrogen::IOStreams ::detail:: stream_state
}
else if( event == std::ios_base::copyfmt_event )
{
get_ptr( ios, idx )= new Type{ get( ios, idx ) };
get_ptr( ios, idx )= new Type{ *get_ptr( ios, idx ) };
}
}
@ -63,13 +70,13 @@ namespace Alepha::Hydrogen::IOStreams ::detail:: stream_state
void
init( std::ios_base &ios )
{
if( not ios.iword( idx ) )
if( not ios.iword( index ) )
{
ios.iword( index() )= 1;
ios.register_callback( callback, idx );
ios.iword( index )= 1;
ios.register_callback( callback, index );
}
auto *&ptr= get_ptr( ios, idx );
if( not ptr ) ptr= new Type{ Default() };
auto *&ptr= get_ptr( ios, index );
if( not ptr ) ptr= new Type{ build() };
}
public:
@ -80,6 +87,12 @@ namespace Alepha::Hydrogen::IOStreams ::detail:: stream_state
return *get_ptr( ios );
}
void
setDefault( const Type value )
{
build= [value] { return value; };
}
struct Setter
{
StreamState *state;
@ -88,17 +101,23 @@ namespace Alepha::Hydrogen::IOStreams ::detail:: stream_state
friend std::ostream &
operator << ( std::ostream &os, const Setter &s )
{
s.get( os )= s.val;
s.state->get( os )= s.val;
return os;
}
friend std::istream &
operator >> ( std::istream &is, const Setter &s )
{
s.get( is )= s.val;
s.state->get( is )= s.val;
return is;
}
};
auto
makeSetter( const Type val )
{
return Setter{ this, val };
}
};
}