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Add potential incompatibility info for Java std::vector wrappers

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William S Fulton 2019-04-18 23:22:01 +01:00
commit b6a675cf1d
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@ -1390,6 +1390,35 @@ Version 4.0.0 (in progress)
2017-05-26: Volker Diels-Grabsch, vadz
[Java] #842 Extend from java.util.AbstractList<> and implement java.util.RandomAccess for
std::vector wrappers. This notably allows to iterate over wrapped vectors in a natural way.
Note that boxed types are now used in the Java layer when wrapping vector of C primitive
types, for example. This may introduce some subtle incompatibilities due to some
differences in how Java converts boxed types and unboxed types. For example,
int i=0;
double d1 = i; // ok
Double d2 = i; // error: incompatible types: int cannot be converted to Double
This can be a problem when calling the add and set functions. A suggested backwards
compatible workaround is to use something like (shown for std::vector<double>:
#if defined(SWIGJAVA)
// Add in old api that uses non-boxed types
%extend std::vector<double> {
%proxycode %{
public void add(double x) {
add(Double.valueOf(x));
}
public void set(int i, double val) {
set(i, Double.valueOf(val));
}
%}
}
#endif
%include "std_vector.i"
%template(VectorDouble) std::vector<double>;
*** POTENTIAL INCOMPATIBILITY ***
2017-05-30: davidcl
[Scilab] #994 Undefined symbol error when loading in Scilab 6