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Mixing Integers and Rational in the new Java API #5085 (#5098)

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* Added covariance to arithmetic operations

* Added distillSort

* Update JavaGenericExample.java

Co-authored-by: Alexander Kreuzer <alexander.kreuzer@sap.com>
Co-authored-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Alexander Kreuzer 2021-03-16 05:24:23 -07:00 • committed by GitHub
parent ee614c2e46
commit dc5fa89de3
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3 changed files with 73 additions and 12 deletions
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29
src/api/java/Expr.java
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@ -17,6 +17,9 @@ Notes:
package com.microsoft.z3;
import java.lang.reflect.Type;
import java.lang.reflect.ParameterizedType;
import com.microsoft.z3.enumerations.Z3_ast_kind;
import com.microsoft.z3.enumerations.Z3_decl_kind;
import com.microsoft.z3.enumerations.Z3_lbool;
@ -2090,12 +2093,38 @@ public class Expr<R extends Sort> extends AST
return Native.getIndexValue(getContext().nCtx(), getNativeObject());
}
private Class sort = null;
/**
* Downcast sort of this expression. {@code
* Expr<ArithSort> mixedExpr = ctx.mkDiv(ctx.mkReal(1), ctx.mkInt(2));
* Expr<RealSort> realExpr = mixedExpr.distillSort(RealSort.class)
* }
*
* @throws Z3Exception if sort is not compatible with expr.
**/
public <S extends R> Expr<S> distillSort(Class<S> newSort) {
if (sort != null && !newSort.isAssignableFrom(sort)) {
throw new Z3Exception(
String.format("Cannot distill expression of sort %s to %s.", sort.getName(), newSort.getName()));
}
return (Expr<S>) ((Expr<?>) this);
}
/**
* Constructor for Expr
* @throws Z3Exception on error
**/
protected Expr(Context ctx, long obj) {
super(ctx, obj);
Type superclass = getClass().getGenericSuperclass();
if (superclass instanceof ParameterizedType) {
Type argType = ((ParameterizedType) superclass).getActualTypeArguments()[0];
if (argType instanceof Class) {
this.sort = (Class) argType;
}
}
}
@Override