A workaround is to write these as a series of separated classes containing anonymous enums:
+A workaround is to write these as a series of separate classes containing anonymous enums:
class PrintingColors {
@@ -557,7 +557,7 @@ std::vector<std::vector<int>> myIntTable;
7.2.14 Explicit conversion operators
-SWIG correctly parses the keyword explicit both for operators and constructors.
+
SWIG correctly parses the keyword explicit for operators in addition to constructors now.
For example:
@@ -575,19 +575,26 @@ class TestClass {
public:
//implicit converting constructor
TestClass(U const &val) { t=val.u; }
+
// explicit constructor
explicit TestClass(V const &val) { t=val.v; }
int t;
};
+
+struct Testable {
+ // explicit conversion operator
+ explicit operator bool() const {
+ return false;
+ }
+};
-The usage of explicit constructors and operators is somehow specific to C++ when assigning the value
-of one object to another one of different type or translating one type to another. It requires both operator and function overloading features,
-which are not supported by the majority of SWIG target languages. Also the constructors and operators are not particulary useful in any
-SWIG target languages, because all use their own facilities (eg. classes Cloneable and Comparable in Java)
-to achieve particular copy and compare behaviours.
+The effect of explicit constructors and operators has little relevance for the proxy classes as target
+languages don't have the same concepts of implicit conversions as C++.
+Conversion operators either with or without explicit need renaming to a valid identifier name in order to make
+them available as a normal proxy method.
7.2.15 Alias templates
diff --git a/Examples/test-suite/cpp11_explicit_conversion_operators.i b/Examples/test-suite/cpp11_explicit_conversion_operators.i
index 5e3ba03df..632355afc 100644
--- a/Examples/test-suite/cpp11_explicit_conversion_operators.i
+++ b/Examples/test-suite/cpp11_explicit_conversion_operators.i
@@ -3,6 +3,9 @@
*/
%module cpp11_explicit_conversion_operators
+%warnfilter(SWIGWARN_LANG_IDENTIFIER) Testable::operator bool;
+%rename(AsInteger) Testable::operator int;
+
%inline %{
class U {
@@ -24,5 +27,15 @@ public:
int t;
};
+
+struct Testable {
+ // explicit conversion operator
+ explicit operator bool() const {
+ return false;
+ }
+ explicit operator int() {
+ return 42;
+ }
+};
%}