added is_open and close methods on fdstreams

fdstream.cpp

@@ -10,18 +10,30 @@
 #include <unistd.h>
 
 sc::io::fdostream::~fdostream() {
+	close();
+}
+
+void sc::io::fdostream::close() {
 	if (_outbuf.fd() != -1) {
 		::close(_outbuf.fd());
 	}
 }
 
 sc::io::fdistream::~fdistream() {
+	close();
+}
+
+void sc::io::fdistream::close() {
 	if (_inbuf.fd() != -1) {
 		::close(_inbuf.fd());
 	}
 }
 
 sc::io::fdstream::~fdstream() {
+	close();
+}
+
+void sc::io::fdstream::close() {
 	if (_iobuf.fd() != -1) {
 		::close(_iobuf.fd());
 	}

libscio.hpp

@@ -61,6 +61,9 @@ namespace sc {
 				int fd() const { return _outbuf.fd(); }
 				void fd(int fd) { _outbuf.fd(fd); }
 
+				bool is_open() const { return _outbuf.fd() != -1; }
+				void close();
+
 			protected:
 				fdiobuf _outbuf;
 		};
@@ -75,6 +78,9 @@ namespace sc {
 				int fd() const { return _inbuf.fd(); }
 				void fd(int fd) { _inbuf.fd(fd); }
 
+				bool is_open() const { return _inbuf.fd() != -1; }
+				void close();
+
 			protected:
 				fdiobuf _inbuf;
 		};
@@ -89,6 +95,9 @@ namespace sc {
 				int fd() const { return _iobuf.fd(); }
 				void fd(int fd) { _iobuf.fd(fd); }
 
+				bool is_open() const { return _iobuf.fd() != -1; }
+				void close();
+
 			protected:
 				fdiobuf _iobuf {-1};
 		};