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I have two self-made separate gems, but both of them have a same function called foo for example, and foo is implemented in C, and it's under the same namespace, so is there a way to determine if I require both gems, which version of foo I use, or is it a way to make sure I'm actually using one of the gem's foo function, someone recommend to use cerr.
Though I know they're redundant, but so far I don't want to remove on of them due to some reasons.
I searched "ruby programmatically find function definition", and found this answer: How can I get source code of a method dynamically and also which file is this method locate in.
This, plus some brief IRB experimentation leads me to believe that you want to do something like:
filename, lineno = method(:foo).source_location
if filename == "blah"
puts "looks like :foo is defined in 'blah'"
elsif filename == "blargh"
puts "looks like :foo is defined in 'blargh'"
end
Here is some more documentation for source_location: http://ruby-doc.org/core-1.9.3/Method.html#method-i-source_location
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I had some fun with imitating OOP in C, but I got somewhat discouraged when I understood that I'll have to call member methods like obj->method(obj, ...). Then I thought about cloning and modifying functions at runtime. Can I implement a function like strdup but for functions using a simple parser to identify the return opcode to stop copying and then modify a value in the function to point to the object the member method refers to so that I can use just obj->method(...)?
No, at least from what it sounds like you are asking, which is to modify functions at run-time. Modifying functions at run-time is possible but is difficult and requires considerable knowledge (and is system-specific). However, you seem to be asking to be able to execute a function and modify the function so that it does something with the object it is associated with. However, by the time the function is executing, there is generally no information about that object available: In a call like obj->method(…), there is generally no reference to obj included in the arguments. So even if you could modify the function at run-time, it does not have the information needed to do the job you want.
There are ways to do it at compile-time. That is how C++ developed. If that is a feature you want, the best approach is to use C++.
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Shorted the title to make it easier for people to understand the problem.
When I've finished adding data to an array, I need to open Activity Monitor and close two processes (Swift and SourceKitService).
Because of the array, Swift and SourceKitService use all available RAM and they have to be closed.
How can I keep adding to the array in the swift file without having to continually close processes?
The Swift compiler is probably getting tied up in knots because your array is long AND it can’t determine the type so needs to rely on implicit checking which is expensive.
The longer the array the bigger the problem.
You may need to provide an explicit type to your declaration.
E.g
let foo: [String] = [“boa”,”fool”,”zoo”,...
Vs
let foo = [“boa”,”fool”,”zoo”,...
Whatever the type of the array elements you should declare this explicitly to assist the compiler when you encounter this issue.
Yes, it should just work, but this is real life and the Swift compiler is young.
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In reading the man pages for tcpdump, I saw that the -dd arguement would output the dump as a fragment of a C file. In what situations is that useful? I take it this is to quickly include and compile the fragment in a program that will be used to process the data according to code we write ourselves? Does this have its utility with unknown or new protocols? Is there some other common, standing situation in which this is needed? Just curious.
It's useful if you're writing a program using libpcap/WinPcap that would use a filter but that, for whatever reason, wouldn't run pcap_compile() to translate a filter string into BPF machine code; it lets you do the compilation with tcpdump and generate some text that you could use in the initialization of an array of struct bpf_insn (a pointer to which, and a count of elements in which, you'd put in a struct bpf_program).
I'm not sure who would do that, however.
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I'm trying to understand why I'm getting a " too few argument to function" message
result = total_area (diameter/3);
and same message come when its volume.
I tried calling both base and perimeter, as height but got a different message, also tried changing the numbers but same.
Look at the definition of the function total_area, and you'll find it is defined to take more parameters.
You only gave it one parameter (diameter/3, aka. one-third of the diameter).This function probably needs a diameter and a height, and perhaps some other parameters(we don't really know because you aren't showing us the definition of the function!)
When you find out what it needs, you'll probably want to call it like:
result = total_area (diameter/3, height, width); // See the other parameters??!
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I'm new to C and I have an assignment where I have to build a dictionary (Linked List in a way). Basically the user inputs several words,year and their definition this:
Example:
love_#_2004_#_LOVING
trade_#_2001_#_INVEST
etc...
And basically I need a function to scan the definition (Ex: INVEST)
and gives me the word trade.
If the definition is related to more than only one word to give me back all the words it relates to.
What sort of a function do I need to scan these strings?
If the word you search is always the last one and the formatting is always the same, then use strtok with _ and copy the last entry, which holds the string you are looking for.