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cpp-docs is a PowerShell library. cpp-docs has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

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There are 624 open issues and 1912 have been closed. On average issues are closed in 28 days. There are 2 open pull requests and 0 closed requests.

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Community Discussions

Trending Discussions on cpp-docs

Operator precedence, inconsistent documentations

x64 doesn't seem to accept an entry point in the END directive as x86 does. Was there any specific reason for this change in the syntax?

Using Gstreamer with Google speech API (Streaming Transcribe) in C++

nlohmann parsing a json file without knowing keys

SSL handshake error (CERTIFICATE_VERIFY_FAILED) in grpc++

Google Speech recognition (cpp samples): undefined reference to AssignDescriptors()

adding google APIs library to cmake build

QUESTION

Operator precedence, inconsistent documentations

Asked 2020-Jan-15 at 07:39

I'm refreshing my memory about operator precedence, because I try to be smart guy and avoid parentheses as much as possible, refreshing on following 2 links:

cpp reference

MS docs

One problem I have, is that those 2 "reliable" docs are not telling the same thing, I no longer know whom to trust?

For one example, Cppreference says throw keyword is in same group as the conditional operator. Microsoft's docs say the conditional operator is higher than throw. There are other differences.

Which site is correct, or are both sites wrong in different ways?

...

ANSWER

Answered 2020-Jan-15 at 07:39

TL;DR: The Microsoft docs can be interpreted to be less correct, depending on how you look at them.

The first thing you have to understand is that C++ as a language does not have "operator precedence" rules. C++ has a grammar; it is the grammar that defines what a particular piece of C++ syntax means. It is the C++ grammar that tells you that 5 + 3 * 4 should be considered equivalent to 5 + (3 * 4) rather than (5 + 3) * 4.

Therefore, any "operator precedence" rules that you see are merely a textual, human-readable explanation of the C++ grammar around expression parsing. As such, one can imagine that two different ways of describing the behavior of the same grammar could exist.

Consider the specific example of throw vs. the ?: operator. The Microsoft site says that ?: has higher precedence than throw, while the Cppreference site says that they have the same precedence.

First, let's look at a hypothetical C++ expression:

Source https://stackoverflow.com/questions/59745513

QUESTION

x64 doesn't seem to accept an entry point in the END directive as x86 does. Was there any specific reason for this change in the syntax?

Asked 2019-Nov-23 at 19:47

According to MS documentation it appears that x86 and x64 assemblies have the same syntax as regards the END directive, i.e., that both accept an optionally entry point [address] with this directive. But given this issue in GitHub, it seems that x64 doesn't accept this option. The example below shows this:

...

ANSWER

Answered 2019-Nov-23 at 19:47

This is unfortunately undocumented behaviour for the x64 version of MASM. On this version of the assembler the END directive doesn't accept an entry point symbol. You must simply end your source with a bare "END" statement. (Making the END directive completely useless, as it hasn't been needed to mark the end of the file since MS-DOS 2.0.)

As a workaround, you can specify the entry point with the /ENTRY linker option, which you can set from the Visual Studio IDE under the project's Property Page -> Linker -> Advanced -> Entry Point. You could also rename your entry point to rely on the linker's default entry point, which depends on the subsystem used, as Microsoft's documentation for /ENTRY states:

By default, the starting address is a function name from the C run-time library. The linker selects it according to the attributes of the program, as shown in the following table.

Source https://stackoverflow.com/questions/59006082

QUESTION

Using Gstreamer with Google speech API (Streaming Transcribe) in C++

Asked 2019-Oct-30 at 23:40

I am using the Google Speech API from cloud platform for getting speech-to-text of a streaming audio. I have already done the REST API calls using curl POST requests for a short audio file using GCP.

I have seen the documentation of the Google Streaming Recognize, which says "Streaming speech recognition is available via gRPC only."

I have gRPC (also protobuf) installed in my OpenSuse Leap 15.0. Here is the screenshot of the directory.

Next I am trying to run the streaming_transcribe example from this link, and I found that the sample program uses a local file as the input but simulate it as a microphone input (catching 64K chunks sequentially) and then send the data to Google server.

For initial tests to check the grpc is correctly set on my system I ran make run_tests. I have changed the Makefile as:

...

ANSWER

Answered 2019-Feb-22 at 04:50

how to run the test

Follow the instructions on cpp-docs-samples. Prerequisit - Install grpc, protobuf, and googleapis and setup the environment as saib in the links above.

gstreamer instead of the function used for simulating the mic-phone audio

For this program I have created pipelines which are

Source https://stackoverflow.com/questions/54514814

QUESTION

nlohmann parsing a json file without knowing keys

Asked 2019-Oct-19 at 13:28

I'm using nlohmann/json library to use json in cpp. I have a Json::Value object and I would like to go through my json data by exploring the keys without knowing them. I came across the documentation but only found the object["mySuperKey"] method to explore the datas which means to know the existing keys.

Can you please give me some tips ?

thanks.

...

ANSWER

Answered 2019-Oct-19 at 13:28

Well after creating a json Object - there are types that can be iterated. in this nlohmann::json implementation you interact with to basic containers (json::object,json::array) both has keys that can be easily retrieved or printed.

Here is a small example that implements a function to recursively (or not) traverse the json object and print the keys and value types.

The code of the Example:

Source https://stackoverflow.com/questions/58068248

QUESTION

SSL handshake error (CERTIFICATE_VERIFY_FAILED) in grpc++

Asked 2019-Feb-04 at 05:41

I am unable to change find the SSL certificate that the grpc speech recognition application uses.

I need to change the certificates as I am under a secure network which monitors all the HTTPS traffic and uses a different certificate than default.

While running the above mentioned speech recognition example, I am getting the error as

...

ANSWER

Answered 2019-Feb-04 at 05:41

This solved my problem.

Just go to /etc/ssl/certs and find where the ca-bundles.pem is pointing.

Go to the file ca-bundles.pem (for me it was in /var/lib/ca-certificates/ca-bundles.pem) and add your certificate manually by copying it from the .pem file.

save the changes and run your tests. :)

Source https://stackoverflow.com/questions/54399358

QUESTION

Google Speech recognition (cpp samples): undefined reference to AssignDescriptors()

Asked 2019-Jan-28 at 09:12

This seems to be a protobuf linking error. I am describing the steps that I followed to get here.

NOTE: Following links are to install the protocol buffer compiler and gRPC. If you already have a running gRPC system then you can skip it

I have installed protobuf and grpc successfully by following the steps mentioned in respective important links.

1.https://github.com/grpc/grpc/blob/master/BUILDING.md

2.https://github.com/grpc/grpc/tree/master/src/cpp

3.https://github.com/protocolbuffers/protobuf

NOTE: Following link is to get and run the sample codes provided by Google for speech recognition applications.

Cloned the repo at https://github.com/GoogleCloudPlatform/cpp-docs-samples/tree/master/speech/api and followed the steps 1-9

On step 9 - make run_tests, I am getting this error

...

ANSWER

Answered 2019-Jan-28 at 09:12

I observed that the grpc++ version 1.19 do not support protobuf-c version 15.

To make this work, I changed the symlink pointer from libprotobuf-c.so.15 to libprotobuf-c.so.17.

Source https://stackoverflow.com/questions/54341578

QUESTION

adding google APIs library to cmake build

Asked 2017-Apr-16 at 17:53

I'm trying to create CMake build to compile my project with google APIs library, the source of google APIs is generated with protocol buffers.

let's say I want to make CMake file for https://github.com/GoogleCloudPlatform/cpp-docs-samples/blob/master/speech/api/streaming_transcribe.cc

streaming_transcribe.cc is using #include "google/cloud/speech/v1beta1/cloud_speech.grpc.pb.h" which is located in the source directory of google APIs and its source is needed to be compiled and linked against the grpc library and grpc++ and a bunch of other sources in the same directory.

the makefile in the samples https://github.com/GoogleCloudPlatform/cpp-docs-samples/blob/master/speech/api/

is compiling the sources in the google APIs directory to object files without linking them to grpc, and then is archived to ar file and just then the streaming_transcribe.cc is compiled and linked with ar file and grpc.

how can I make the same process for cmake file build?

...

ANSWER

Answered 2017-Apr-16 at 17:53

Archive of object files is a static library. With CMake you may create it with:

Source https://stackoverflow.com/questions/43160922

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Welcome! This repository contains source files for the work-in-progress Microsoft C++ (MSVC or Visual C++) technical documentation. The articles are published on the C++ in Visual Studio documentation site. The documentation for Visual Basic and Visual C# are located in a separate repository at https://github.com/dotnet/core-docs, and the Visual Studio documentation is located in the repository located at https://github.com/Microsoft/visualstudio-docs.

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