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What is a 'semantic predicate' in ANTLR?
... of semantic predicates in Antlr4
Semantic predicates in ANTLR4?
ANTLR 3
A semantic predicate is a way to enforce extra (semantic) rules upon grammar
actions using plain code.
There are 3 types of semantic predicates:
validating semantic predicates;
gated semantic predicates;
disambiguating...
Intellij IDEA Java classes not auto compiling on save
...
253
UPDATED
For IntelliJ IDEA 12+ releases we can build automatically the edited sources if we are ...
How to create a GUID/UUID in Python
...rce]
Docs:
Python 2: http://docs.python.org/2/library/uuid.html
Python 3:
https://docs.python.org/3/library/uuid.html
Example (working on 2 and 3):
>>> import uuid
>>> uuid.uuid4()
UUID('bd65600d-8669-4903-8a14-af88203add38')
>>> str(uuid.uuid4())
'f50ec0b7-f960-400...
Remove empty strings from a list of strings
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1203
I would use filter:
str_list = filter(None, str_list)
str_list = filter(bool, str_list)
str_lis...
Why should I prefer to use member initialization lists?
...) { x = x_; }
int x;
};
class B
{
public:
B()
{
a.x = 3;
}
private:
A a;
};
In this case, the constructor for B will call the default constructor for A, and then initialize a.x to 3. A better way would be for B's constructor to directly call A's constructor in the ini...
Proper way to wait for one function to finish before continuing?
...
answered Feb 3 '14 at 1:24
Matt WayMatt Way
27.3k1010 gold badges6565 silver badges7575 bronze badges
...
Iterating Through a Dictionary in Swift
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360
Dictionaries in Swift (and other languages) are not ordered. When you iterate through the dict...
Wrapping null-returning method in Java with Option in Scala?
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183
The Option companion object's apply method serves as a conversion function from nullable referen...
File content into unix variable with newlines
...:
pax> function count {
...> echo $#
...> }
pax> count 1 2 3
3
pax> count a b c d
4
pax> count $x
4
pax> count "$x"
1
Here, the count function simply prints out the number of arguments given. The 1 2 3 and a b c d variants show it in action.
Then we try it with the two va...
How is OAuth 2 different from OAuth 1?
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538
Eran Hammer-Lahav has done an excellent job in explaining the majority of the differences in hi...