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MySQL - length() vs char_length()
...
LENGTH() returns the length of the string measured in bytes.
CHAR_LENGTH() returns the length of the string measured in characters.
This is especially relevant for Unicode, in which most characters are encoded in two bytes. Or UTF-8, where the number of by...
How does HashSet compare elements for equality?
...c class Employe
{
public Employe() {
}
public string Name { get; set; }
public override string ToString() {
return Name;
}
public override bool Equals(object obj) {
return this.Name.Equals(((Employe)obj).Name);
}...
Floating point vs integer calculations on modern hardware
...application. If you are developing for the x86 architecture, and you need extra performance, you might want to look into using the SSE extensions. This can greatly speed up single-precision floating point arithmetic, as the same operation can be performed on multiple data at once, plus there is a ...
What's “wrong” with C++ wchar_t and wstrings? What are some alternatives to wide characters?
...e in the C++ community(particularly ##c++ on freenode) resent the use of wstrings and wchar_t , and their use in the windows api. What is exactly "wrong" with wchar_t and wstring , and if I want to support internationalization, what are some alternatives to wide characters?
...
Output array to CSV in Ruby
... "of", "CSV", "data"]
csv << ["another", "row"]
# ...
end
To a string:
require 'csv'
csv_string = CSV.generate do |csv|
csv << ["row", "of", "CSV", "data"]
csv << ["another", "row"]
# ...
end
Here's the current documentation on CSV: http://ruby-doc.org/stdlib/libdoc/...
JNI converting jstring to char *
I have passed a URL string from Java to C code as jstring data type through the use of JNI. And my library method needs a char * as url.
...
How to tag an older commit in Git?
...ommit'
git push --tags origin master
where tag is set to the desired tag string, and commit to the commit hash.
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How to check if a model has a certain column/attribute?
... a class
Use Class.column_names.include? attr_name where attr_name is the string name of your attribute.
In this case: Number.column_names.include? 'one'
For an instance
Use record.has_attribute?(:attr_name) or record.has_attribute?('attr_name') (Rails 3.2+) or record.attributes.has_key? attr_na...
TLSF源码及算法介绍 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...*/
#ifndef USE_PRINTF
#define USE_PRINTF (1)
#endif
#include <string.h>
#ifndef TLSF_USE_LOCKS
#define TLSF_USE_LOCKS (0)
#endif
#ifndef TLSF_STATISTIC
#define TLSF_STATISTIC (0)
#endif
#ifndef USE_MMAP
#define USE_MMAP (0)
#endif
#ifndef USE_SBRK
#define USE_SBRK ...
Can an angular directive pass arguments to functions in expressions specified in the directive's att
...cript and my callback looks like this: public validateFirstName(firstName: string, fieldName: string): ng.IPromise<boolean> { var deferred = this.mQService.defer<boolean>(); ... .then(() => deferred.resolve(true)) .catch((msg) => { ...