private static Func <ILGenerator, ILGenerator> LookUpForClass2String(Type source, Type destination)
{
if (source.IsValueType)
{
return(null);
}
if (typeof(String) != destination)
{
return(null);
}
// instance or null is on top of the stack
return(il => il
.Dup()
.If(true, x => x
.Callvirt(FromLambda.Method <Object, String>(o => o.ToString()))
));
}
private static Func <ILGenerator, ILGenerator> LookUpForEnum2String(Type source, Type destination)
{
if (!source.IsEnum)
{
return(null);
}
if (typeof(String) != destination)
{
return(null);
}
// unboxed enum is on top of the stack
return(il => il
.Box(source)
.Ldstr("d")
.Call(FromLambda.Method <Enum, String, String>((e, f) => e.ToString(f)))
);
}
private static Func <ILGenerator, ILGenerator> LookUpForStruct2String(Type source, Type destination)
{
if (!source.IsValueType)
{
return(null);
}
if (typeof(String) != destination)
{
return(null);
}
LocalBuilder value;
// struct is on top of the stack
return(il => il
.DefineLocal(source, out value)
.Stloc(value)
.Ldloca(value)
.Constrained(source)
.Callvirt(FromLambda.Method <Object, String>(o => o.ToString()))
);
}