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Ruby max integer
...t to how big they can be.
If you are looking for the machine's size, i.e. 64- or 32-bit, I found this trick at ruby-forum.com:
machine_bytes = ['foo'].pack('p').size
machine_bits = machine_bytes * 8
machine_max_signed = 2**(machine_bits-1) - 1
machine_max_unsigned = 2**machine_bits - 1
If you ...
Memory address of variables in Java
... that identity hash codes are not guaranteed to be unique. For instance on 64-bit JVM there are 2^32 identity hash codes but 2^64 memory addresses.
– Alex Jasmin
Dec 25 '09 at 14:42
...
How to find the mysql data directory from command line in windows
...----+
| basedir | /usr/local/mysql-5.7.17-macos10.12-x86_64/ |
| character_sets_dir | /usr/local/mysql-5.7.17-macos10.12-x86_64/share/charsets/ |
| datadir | /usr/local/mysql/data/ |
| innodb_data_home_dir ...
“Code too large” compilation error in Java
...
A single method in a Java class may be at most 64KB of bytecode.
But you should clean this up!
Use .properties file to store this data, and load it via java.util.Properties
You can do this by placing the .properties file on your classpath, and use:
Properties propert...
What is better, adjacency lists or adjacency matrices for graph problems in C++?
... a list takes up more memory than a matrix:
8e > n2/8 when d > 1/64
So with these numbers (still 32-bit specific) the breakpoint lands at 1/64.
If the density (e/n2) is bigger than 1/64, then a matrix is preferable if you want to save memory.
You can read about this at wikipedia (artic...
Eclipse secure storage
...
In windows 7 enerprise 64 bits + java 8
In eclipse go to :
Preferences
--> General
-> security
-> secure Storage.
In master Password providers UNCKECK Windows integration (64 bits)
Then go to General -- network...
jquery save json data object in cookie
... to a bug in some browsers.
Before using it, you should convert it to base64 (using btoa), and when reading it, convert from base64 (using atob).
val = JSON.stringify(userData)
val = btoa(val)
write_cookie(val)
share
...
Set transparent background of an imageview on Android
...
64
@AnhSirkDasarp Not only from 01 to 99, as the rest of the numbers these are also hexadecimal so you can put anything from 00 to ff. For fif...
OceanBase使用libeasy原理源码分析：客户端 - 数据库(内核) - 清泛网 - 专...
...easy的如下两个上层接口：
easy_session_t *easy_session_create(int64_t asize)
int easy_client_dispatch(easy_io_t *eio, easy_addr_t addr, easy_session_t *s)
首先看看session这个关键的数据结构：
#define EASY_MESSAGE_SESSION_HEADER \
easy_connection_t *c; \
easy...
Hashing a dictionary?
..._dict__)) # 1209812346789
foo.a = 1
print (make_hash(foo.__dict__)) # -78956430974785
Alas, when you attempt to do the same thing with the class itself:
print (make_hash(Foo.__dict__)) # TypeError: unhashable type: 'dict_proxy'
The class __dict__ property is not a normal dictionary:
print (typ...