google-cloud-cpp | C++ Client Libraries for Google Cloud Services | GCP library
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QUESTION
I want to program the google-cloud-spanner in C++.
The api-package I use is from https://github.com/googleapis/google-cloud-cpp.
In the code https://github.com/googleapis/google-cloud-cpp/blob/main/google/cloud/spanner/samples/samples.cc from line 1677ff, one can see the method "EmplaceRow" from "InsertOrUpdateMutationBuilder", or the not very much simpler "MakeInsertOrUpdateMutation" from line 1739 till 1743.
Looking in
https://googleapis.dev/cpp/google-cloud-spanner/latest/namespacegoogle_1_1cloud_1_1spanner.html
the example code for "EmplaceRow" and "MakeInsertOrUpdateMutation" can be seen.
More precise you can see the "EmplaceRow" example code on
https://googleapis.dev/cpp/google-cloud-spanner/latest/namespacegoogle_1_1cloud_1_1spanner.html#a3451b640c4ee19df694fa0539047fcdc
and the "MakeInsertOrUpdateMutation" example code on
https://googleapis.dev/cpp/google-cloud-spanner/latest/namespacegoogle_1_1cloud_1_1spanner.html#aced68ba9bc789f44693ad29962fc6ed6
My Problem is:
How can I create a variable (!) list of arguments to pass them into "EmplaceRow" or in "MakeInsertOrUpdateMutation" as "Ts &&... values".
And the "a variable list of arguments" means that this "list" (not a std::list) can be used in the mentioned manner as "Ts &&... values"-list.
Until now I did a lot of searching for a solution but I found no propper one:
- Two template functions by using a std::tuple to expand its tuple elements to the "Ts &&... values"-list.
- Two template functions by using a std::array to expand its array elements to the "Ts &&... values"-list.
Both solutions are "nice" but not useful!
I want process different tables with different number of columns during runtime but the size of std::tuple and std::array have to be fixed at compile-time (!).
Thus, creating a "Ts &&... values"-list during runtime can't be solved by std::tuple and std::array.
So ... how can I create from a std::vector, std::list, or other container-types, which could be created, resized and filled with "spanner::Value"-values, that "Ts &&... values"-list to pass it to "EmplaceRow" or "MakeInsertOrUpdateMutation".
Here is my code for expanding the std::tuple to an "Ts &&... values"-list:
...ANSWER
Answered 2022-Mar-04 at 16:14Replace EmplaceRow
with AddRow and that should do the trick.
You cannot convert runtime arguments to template arguments in a practical way here. (I could less than helpfully show you how, but trust me, bad plan here; I only don't say "impossible" because I dislike lying.)
I find google's C++ docs to require being willing and able to read the raw headers and sometimes source code. Here, I found the class where EmplaceRow
was defined and looked for either what it did, or an alternative method.
Emplace
in C++ lingo means "perfect forward into storage"; usually there is an imperfect forwarding method nearby (like, push_back
vs emplace_back
) for when templates get in the way.
QUESTION
I want to find a C++ example of receiving data via Google's "cloud" via Google's Pub/Sub.
Here it seems that C++ isn't supported:
https://github.com/googleapis/google-cloud-cpp/issues/777
and again here:
https://stackoverflow.com/a/62573062/997112
But on the main Github page:
https://github.com/googleapis/google-cloud-cpp
It says the languages are 90.5% C++.
Can anyone help/is it possible to receive data from the Google Cloud in C++?
...ANSWER
Answered 2021-Mar-02 at 18:10The Cloud Pub/Sub client library in C++ recently became available. Code samples in the Pub/Sub documentation should all have C++ examples, for example, publishing messages and receiving messages.
QUESTION
I'm using google-cloud-cpp SDK from here: https://github.com/googleapis/google-cloud-cpp. However, I can't seem to figure out how to enable logging for the client library and find out where the log file goes. I'm interested in seeing all the HTTP requests being made to the endpoint. Appreciate any help and/or examples.
...ANSWER
Answered 2020-Jun-10 at 17:33You need to set two environment variables:
GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes
will redirect the logs tostd::clog
, the library does not create a log backend otherwise.GOOGLE_CLOUD_CPP_STORAGE_TRACING=http,raw-client
otherwise logging is not even turned on.
You can find more information about environment variables for the SDK in the API Notes
section of: https://googleapis.dev/cpp/google-cloud-storage/latest/index.html
QUESTION
This is the sample CPP file which includes a GCP header file:
...ANSWER
Answered 2020-Mar-20 at 17:32It appears that you need to also add the following into your environment:
QUESTION
The CMake build of google-cloud-cpp
fails with this error:
ANSWER
Answered 2020-Mar-20 at 16:16The CMake command:
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