private static Func <T, int> MakeGetHashCodeNotNull <T>()
where T : struct
{
var param = Expression.Parameter(typeof(T), "input");
return(Expression.Lambda <Func <T, int> >(NullSafetyExpression.Create(param, p => p.Call(nameof(GetHashCode))), param).Compile());
}
/// <summary>
/// Creates a new safe navigation expression.
/// </summary>
/// <param name="target">The expression that is guarded by <see langword="null"/> check.</param>
/// <param name="body">The body to be executed if <paramref name="target"/> is not <see langword="null"/>. </param>
/// <returns>The expression representing safe navigation.</returns>
public static NullSafetyExpression Create(Expression target, Func <ParameterExpression, Expression> body)
{
var result = new NullSafetyExpression(target);
result.Body = body(result.Target);
return(result);
}
private static Func <T, string> MakeToString <T>()
{
var param = Expression.Parameter(typeof(T), "input");
return(Expression.Lambda <Func <T, string> >(NullSafetyExpression.Create(param, p => p.Call(nameof(ToString))), param).Compile());
}