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Why use #ifndef CLASS_H and #define CLASS_H in .h file but not in .cpp?
...f it's included again, the contents of the file (inside the #ifndef/#endif block) are skipped.
There's no need to do this for the source file itself since (normally) that's not included by any other files.
For your last question, class.h should contain the definition of the class, and declarations...
How to programmatically send SMS on the iPhone?
...putting the MFMessageComposeViewController *controller = ... inside the if block. (the class method does not need to have an instance to do the test)
– unsynchronized
Dec 13 '13 at 4:12
...
How to Rotate a UIImage 90 degrees?
... want the pixels of the UIImage to actually shift position. I am using a block of code (shown below) originally intended to resize a UIImage to do this. I set a target size as the current size of the UIImage but I get an error:
...
Getting Chrome to accept self-signed localhost certificate
... but it's not in the form of a Tab. It appears as a collapsible/expandable block. i.imgur.com/dDmNEIh.png
– cavalcade
Aug 22 '13 at 0:52
...
How do you run your own code alongside Tkinter's event loop?
...t itself back on the event loop immediately after finishing. this will not block other events, while still running your code as often as possible.
– Nathan
Sep 9 '09 at 3:27
...
Aren't promises just callbacks?
... occur before this point
});
Pretty much the same as a try { ... } catch block.
Even better:
api().then(function(result){
return api2();
}).then(function(result2){
return api3();
}).then(function(result3){
// do work
}).catch(function(error) {
//handle any error that may occur...
CSS Input with width: 100% goes outside parent's bound
..., 0, 0.2);
border-radius: 2px;
width: 320px;
}
label span {
display: block;
padding: .3em 1em;
background-color: rgb(215, 215, 215);
border-radius: .25em;
border: 1px solid rgb(114, 114, 114);
box-shadow: 0 1px 0 rgba(24, 24, 24, 0.1);
margin: 0 0 1em;
}
label span:hover {
backgr...
Class type check in TypeScript
...function inside an if statement, and be sure that all the code inside that block is safe to use as the type you think it is.
Example from the TypeScript docs:
function isFish(pet: Fish | Bird): pet is Fish {
return (<Fish>pet).swim !== undefined;
}
// Both calls to 'swim' and 'fly' are n...
How to compare 2 files fast using .NET?
...read less bytes than the requested number. You should use StreamReader.ReadBlock() instead.
– Palec
Feb 18 '16 at 13:41
2
...
How to convert a string or integer to binary in Ruby?
...king up on bta's lookup table idea, you can create the lookup table with a block. Values get generated when they are first accessed and stored for later:
>> lookup_table = Hash.new { |h, i| h[i] = i.to_s(2) }
=> {}
>> lookup_table[1]
=> "1"
>> lookup_table[2]
=> "10"
>...