If constraints for std::promise and std::future are not met an exception of type
std::future_error is thrown.
The error code member in the exception is of type std::future_errc and values are as below, along with some test cases:
enum class future_errc {
broken_promise = /* the t...
Getting a GA Account:
If you don’t have an Analytics account, create one. If you do have an Analytics account, sign in. Both options are available at google.com/analytics
Setting up a property in your Analytics account:
A property represents your website or app where the data gets aggrega...
The gross majority of the time a SyntaxError which points to an uninteresting line means there is an issue on the line before it (in this example, it's a missing parenthesis):
def my_print():
x = (1 + 1
print(x)
Returns
File "<input>", line 3
print(x)
^...
To complete this objective following tasks are required.
Foreach Loop Container: To iterate over a user configured directory for files.
Expression Task: To update a variable if file exists.
Steps
First goto Solution Explorer double click on Project.params and create a parameter FolderPat...
The below coordinator job will trigger coordinator action once in a day that executes a workflow. The workflow has a shell script that moves input to output.
<coordinator-app name="log_process_coordinator" frequency="${coord:days(1)}" start="2017-04-29T06:00Z" ...
Copy the script, coordinator.xml and workflow.xml into HDFS. coordinator.xml must be present in the directory specified by oozie.coord.application.path in job.properties. workflow.xml should be present in the directory specified by workflowAppUri. Once everything is in place, run the below command f...
Table/Column Names
Two common ways of formatting table/column names are CamelCase and snake_case:
SELECT FirstName, LastName
FROM Employees
WHERE Salary > 500;
SELECT first_name, last_name
FROM employees
WHERE salary > 500;
Names should describe what is stored in their object. Th...
SELECT * returns all columns in the same order as they are defined in the table.
When using SELECT *, the data returned by a query can change whenever the table definition changes. This increases the risk that different versions of your application or your database are incompatible with each other....
There is no widely accepted standard. What everyone agrees on is that squeezing everything into a single line is bad:
SELECT d.Name, COUNT(*) AS Employees FROM Departments AS d JOIN Employees AS e ON d.ID = e.DepartmentID WHERE d.Name != 'HR' HAVING COUNT(*) > 10 ORDER BY COUNT(*) DESC;
At th...
Creating Express Web Server
Express server came handy and it deeps through many user and community. It is getting popular.
Lets create a Express Server. For Package Management and Flexibility for Dependency We will use NPM(Node Package Manager).
Go to the Project directory and create package....
if len(sys.argv) != 4: # The script name needs to be accounted for as well.
raise RuntimeError("expected 3 command line arguments")
f = open(sys.argv[1], 'rb') # Use first command line argument.
start_line = int(sys.argv[2]) # All arguments come as strings, so need to ...
# The name of the executed script is at the beginning of the argv list.
print('usage:', sys.argv[0], '<filename> <start> <end>')
# You can use it to generate the path prefix of the executed program
# (as opposed to the current module) to access files relative to that,
# which...
# Error messages should not go to standard output, if possible.
print('ERROR: We have no cheese at all.', file=sys.stderr)
try:
f = open('nonexistent-file.xyz', 'rb')
except OSError as e:
print(e, file=sys.stderr)
def main():
if len(sys.argv) != 4 or '--help' in sys.argv[1:]:
print('usage: my_program <arg1> <arg2> <arg3>', file=sys.stderr)
sys.exit(1) # use an exit code to signal the program was unsuccessful
process_data()
$man <command>
Displays the on-line manual pages for the command
$clear
Clears the terminal screen
$pwd
Returns the working directory name
$echo <string>
Writes the string to the standard output
$printf <string>
Format and print the string
Example: print $PATH
...
A common problem with remote services is rate limiting. The remote service allows us to send only a limited number of requests or amount of data per time period.
In RxJS 5 a very similar functionality is provided by the bufferTime operator and especially if we leave the second parameter unspecified...
This example contains over 1000 lines of code in total (too much to be embedded here). For that reason all code is accessible on http://blockbuilder.org/SumNeuron/956772481d4e625eec9a59fdb9fbe5b2 (alternatively hosted at https://bl.ocks.org/SumNeuron/956772481d4e625eec9a59fdb9fbe5b2). Note the bl.oc...
