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“Undefined reference to” template class constructor [duplicate]
...n the entire compilation process, or we will get the 'undefined reference' error. (This applies to the other methods of cola<T> also.)
Understanding the problem
The problem is caused by the fact that main.cpp and cola.cpp will be compiled separately first. In main.cpp, the compiler will impl...
How to create enum like type in TypeScript?
...gned to it. This is demonstrated below:
let foo: 'Hello';
foo = 'Bar'; // Error: "Bar" is not assignable to type "Hello"
They are not very useful on their own but can be combined in a type union to create a powerful (and useful) abstraction e.g.:
type CardinalDirection =
"North"
| "East"...
Why aren't python nested functions called closures?
...ou try
def initCounter():
x = 0;
def counter ():
x += 1 ##Error, x not defined
print x
return counter
count = initCounter();
count(); ##Error
count();
count();
You'll get an error saying that x is not defined. But how can that be if it has been shown by others that y...
How do I add a submodule to a sub-directory?
...hub.com:...> in the snipmate-snippets directory, I get the following error message:
5 Answers
...
Detect if Android device has Internet connection
...e() == 200);
} catch (IOException e) {
Log.e(LOG_TAG, "Error checking internet connection", e);
}
} else {
Log.d(LOG_TAG, "No network available!");
}
return false;
}
Of course you can substitute the http://www.google.com URL for any other server you ...
How to get Maven project version to the bash command line
...
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.3.2:exec (default-cli) on project audit-events-processor-parent: Command execution failed. Cannot run program "maven" (in directory "/tmp"): error=2, No such...
Proper way to make HTML nested list?
...the <li> it belongs in.
If you validate, option 1 comes up as an error in html 5 -- credit: user3272456
Correct: <ul> as child of <li>
The proper way to make HTML nested list is with the nested <ul> as a child of the <li> to which it belongs. The nested list s...
How do I address unchecked cast warnings?
... output.put(k, v);
} else {
throw new AssertionError(
"Cannot cast to HashMap<"+ keyClass.getSimpleName()
+", "+ valueClass.getSimpleName() +">"
+", value "+ value +" is not a "+ valueClass.getSimpleName()
...
Debugging WebSocket in Google Chrome
... and then you can see the Frames (now called Messages) which will show you error messages etc.
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Is there a difference between YES/NO,TRUE/FALSE and true/false in objective-c?
...a *data = [NSJSONSerialization dataWithJSONObject:requestParams options:0 error:nil];
NSString *jsonString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
The result is
jsonString1 // {"bool":1}
jsonString2 // {"bool":true}
jsonString3 // {"bool":true}
Due to API logic js...