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here try it:

You have two user defined conversions:

• a.Value is a property. It has a user defined conversion operator to B.
• B has a user defined conversion operator to int.

They cannot form a so called implicit conversion sequence and therefore you need to explicitly convert a.Value to B first. From cppreference.com:

Implicit conversion sequence consists of the following, in this order:

1) zero or one standard conversion sequence;

2) zero or one user-defined conversion;

3) zero or one standard conversion sequence.

nevertheless, if i just cannot achieve it, does it mean that i'll get more cost for explicit conversion?

No, an optimizing compiler will have no issues turning this into a direct access of the encapsulated integer.

You can however use a conversion operator template to get what you need:

You effectively have the following:

I found the solution for this issue is that you have to change few things in MQTT files.

Changes to be done in the content of the following file which is inside paho-mqtt folder. In my case it is inside D:\vcpkg\installed\x64-windows\include\paho-mqtt

MQTTAsync

MQTTClient

MQTTProperties

MQTTReasonCodes

In all the above file change the following content.

Programs running atop a kernel use virtual addressing, this means that a given program cannot access the address space of another. If you would like to facilitate interprocess communication consider Unix sockets.

You can't 'stream' a PDF file, because it requires random access to the internals of the file in order to interpret it. (for example, the cross-reference table is normally stored towards the end of the file, and the offset to the cross reference table is stored at the end of the file)

If you feed a PDF file to Ghostscript via stdin normally (ie not using your PostScript code) then Ghostscript writes it to a temporary file on disk before it starts processing it.

Note that your PostScript code is highly Ghostscript-specific (its using PostScript extensions that only exist on Ghostscript) and won't work with any other interpreter.

The code expects to read from a file:

I believe you want either:

The Rcpp sugar functions are meant for vector type arguments like Rcpp::NumericVector. For scalar arguments you can use the functions in the R namespace:

I finally found a workaround on this broken MS async output redirection. I used this code https://stackoverflow.com/a/13860551/1502444 to be able to read each chars of the output by using StandardOutput.Read() method in a different thread and changing the Read buffer size. Would like to thanks the author of this solution and raterus to pointed out the async read problem.