Add non-throwing variants of Query methods.

Pl has also been refactored, so that the unnecessary throw and
catch have been removed.

1 files changed, 12 insertions, 0 deletions

diff --git a/c/pl.cpp b/c/pl.cpp
index 6e71383..665fe3a 100644
--- a/c/pl.cpp
+++ b/c/pl.cpp
@@ -55,6 +55,10 @@ Query::~Query()
 	PL_cut_query(m_q);
 }
 
+int Query::Cut(std::nothrow_t)
+{
+	return PL_cut_query(m_q);
+}
 int Query::Cut()
 {
 	if (PL_cut_query(m_q)) return 1;
@@ -63,6 +67,10 @@ int Query::Cut()
 }
 
 /* Cut query and invalidate associated data. */
+int Query::Close(std::nothrow_t)
+{
+	return PL_close_query(m_q);
+}
 int Query::Close()
 {
 	if (PL_close_query(m_q)) return 1;
@@ -70,6 +78,10 @@ int Query::Close()
 	return 0;
 }
 
+int Query::NextSolution(std::nothrow_t)
+{
+	return PL_next_solution(m_q);
+}
 int Query::NextSolution()
 {
 	if (PL_next_solution(m_q)) return 1;