DelegateParameter0 Delegate

Provide a predefined Delegate to register a C# method to be called from SWI-Prolog

Declaration Syntax

Visual Basic

Visual C++

public delegate bool DelegateParameter0()

Public Delegate Function DelegateParameter0 As Boolean

public delegate bool DelegateParameter0()

type DelegateParameter0 = 
    delegate of unit -> bool

Return Value

Boolean
true for succeeding otherwise false for fail

Examples

This example is for DelegateParameter2 and shows how o call a C# method with two parameter.

For other samples see the source file CallbackForeigenPredicate.cs in the TestSwiPl VS2008 test project.

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public void t_in_out() { Delegate replaceDelegate = new DelegateParameter2(atom_replace); PlEngine.RegisterForeign(replaceDelegate); for (int i = 1; i < 10; i++) { PlTermV arg = new PlTermV(new PlTerm("test_f"), PlTerm.PlVar()); PlQuery.PlCall("atom_replace", arg); Assert.AreEqual("test_xx_f", arg[1].ToString(), "atom_replace failed!"); } } public static bool atom_replace(PlTerm atom_in, PlTerm atom_out) { return atom_out.Unify(atom_in.ToString().Replace("_", "_xx_")); }

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public void t_in_out()
{
    Delegate replaceDelegate = new DelegateParameter2(atom_replace);
    PlEngine.RegisterForeign(replaceDelegate);
    for (int i = 1; i < 10; i++)
    {
        PlTermV arg = new PlTermV(new PlTerm("test_f"), PlTerm.PlVar());
        PlQuery.PlCall("atom_replace", arg);
        Assert.AreEqual("test_xx_f", arg[1].ToString(), "atom_replace failed!");
    }
}
public static bool atom_replace(PlTerm atom_in, PlTerm atom_out)
{
    return atom_out.Unify(atom_in.ToString().Replace("_", "_xx_"));
}