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How can I build a small operating system on an old desktop computer? [closed]
...iles and devices, reading and writing, passing messages between processes, etc.
Read up on x86 assembly (assuming you are designing this for an x86 machine). That should answer a lot of your questions with regards to moving between processor operating modes.
If you've got any electronics knowledg...
Ruby on Rails: How do I add a not null constraint to an existing column using a migration?
... Add column with default value
2) THEN: Remove default value
add_column :orders, :items, :integer, null: false, default: 0
change_column :orders, :items, :integer, default: nil
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How do I convert an enum to a list in C#? [duplicate]
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Awesome. Just realized that the ordering of the list can be specified by the 'value' of the enums. Ex: enum Foo { A = 1, B = 2, D = 4, C = 3, } => Once this is ran thru the GetValue and Cast, then the order is A, B, C, D. Fantastic!
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'Missing contentDescription attribute on image' in XML
...ut methods because of their disability (Like TalkBack, Tecla Access Shield etc etc).
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what is the use of xsi:schemaLocation?
... read the schemaLocation values and try to load them from the internet, in order to validate the XML file. Spring, in turn, intercepts those load requests and serves up versions from inside its own JAR files.
If you omit the schemaLocation, then the XML parser won't know where to get the schema in ...
Side-by-side plots with ggplot2
...rint the side effect to a file, specify a device driver (such as pdf, png, etc), e.g.
pdf("foo.pdf")
grid.arrange(plot1, plot2)
dev.off()
or, use arrangeGrob() in combination with ggsave(),
ggsave("foo.pdf", arrangeGrob(plot1, plot2))
This is the equivalent of making two distinct plots using p...
Postgresql SELECT if string contains
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shouldn't be the order of aaaa and tag_name reversed? i mean that you should put a column name after where
– user151496
May 11 '15 at 15:10
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Looking for ALT+LeftArrowKey solution in zsh
... switch shells (If you SSH into some other shell, switch from BASH to ZSH, etc and you lose some if not all of your keybindings).
Most shells have a set of default sequences that come pre-bound. Furthermore, while they aren't 100% consistent, they're close enough. So the easiest way that I have fou...
Move assignment operator and `if (this != &rhs)`
... function, and utilize a mix of rvalue references and lvalue references in order to "prevent" extra temporaries from being created during some stacked addition operation on the object-type:
struct A; //defines operator=(A&& rhs) where it will "steal" the pointers
//of rhs and set ...
Node.js throws “btoa is not defined” error
...rs (i.e. if you plan to exchange base64 between Node.js and a browser). In order to make it work you have to mark the input text as 'binary'.
Buffer.from('Hélló wórld!!', 'binary').toString('base64')
This gives you SOlsbPMgd/NybGQhIQ==. If you make atob('SOlsbPMgd/NybGQhIQ==') in a browser it...