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What is ?= in Makefile

... @Simon Note that command line arguments to make already override Makefile variables without the need of ?=. – CMCDragonkai Aug 22 '18 at 4:52 ...
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How to bind RadioButtons to an enum?

... return Enum.Parse(targetType, parameterString); } #endregion } And in the XAML-Part you use: <Grid> <Grid.Resources> <l:EnumBooleanConverter x:Key="enumBooleanConverter" /> </Grid.Resources> <StackPanel > <RadioButton IsChecked="{...
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How to play with Control.Monad.Writer in haskell?

I'm new to functional programming and recently learning at Learn You a Haskell , but when I went through this chapter , I got stuck with the program below: ...
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performing HTTP requests with cURL (using PROXY)

...erver:port/ Then you can connect through proxy from (many) application. And, as per comment below, for https: export https_proxy=https://your.proxy.server:port/ share | improve this answer ...
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Difference between a user and a schema in Oracle?

What is the difference between a user and a schema in Oracle? 15 Answers 15 ...
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How to change the default charset of a MySQL table?

... If you want to change the table default character set and all character columns to a new character set, use a statement like this: ALTER TABLE tbl_name CONVERT TO CHARACTER SET charset_name; So query will be: ALTER TABLE etape_prospection CONVERT TO CHARACTER SET utf8; ...
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Return array in a function

... Is kind of just syntactic sugar. You could really replace it with this and it would still work: int fillarr(int* arr) So in the same sense, what you want to return from your function is actually a pointer to the first element in the array: int* fillarr(int arr[]) And you'll still be able t...
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Select element by exact match of its content

... "bold"); It's not a selector, but it does the job. :-) If you want to handle whitespace before or after the "hello", you might throw a $.trim in there: return $.trim($(this).text()) === "hello"; For the premature optimizers out there, if you don't care that it doesn't match <p><span&...
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How can I catch a ctrl-c event?

...;stdlib.h> #include <stdio.h> #include <unistd.h> void my_handler(int s){ printf("Caught signal %d\n",s); exit(1); } int main(int argc,char** argv) { struct sigaction sigIntHandler; sigIntHandler.sa_handler = my_handler; sigemptyset(&sigIntHand...
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How to add an auto-incrementing primary key to an existing table, in PostgreSQL?

...e with existing data. Is there a way to add a primary key without deleting and re-creating the table? 4 Answers ...