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How to grep (search) committed code in the Git history
...
You should use the pickaxe (-S) option of git log.
To search for Foo:
git log -SFoo -- path_containing_change
git log -SFoo --since=2009.1.1 --until=2010.1.1 -- path_containing_change
See Git history - find lost line by keyword for more.
As Jakub Narębski commented:
this looks for...
What is the exact problem with multiple inheritance?
... 12 ... "speak" ... 4 byte function pointer
class B:
at offset 0 ... "foo" ... 2 byte short field
at offset 2 ... 2 bytes of alignment padding
at offset 4 ... "bar" ... 4 byte array pointer
at offset 8 ... "baz" ... 4 byte function pointer
When the compiler generates machine code ...
Easy way to print Perl array? (with a little formatting)
.... Example:
use Data::Dumper;
# simple procedural interface
print Dumper($foo, $bar);
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No appenders could be found for logger(log4j)?
...%x - %m%n
# Print only messages of level WARN or above in the package com.foo.
log4j.logger.com.foo=WARN
Here is another configuration file that uses multiple appenders:
log4j.rootLogger=debug, stdout, R
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apa...
Compile time string hashing
...space my_hash::literals;
void one() {} void two() {} void other() {}
void foo( const std::string& value )
{
switch( my_hash::hash(value) )
{
case "one"_hash: one(); break;
case "two"_hash: two(); break;
/*many more cases*/
default: other(); break;
}
}
live example.
Note...
Is gcc's __attribute__((packed)) / #pragma pack unsafe?
...lude <stdio.h>
#include <stddef.h>
int main(void)
{
struct foo {
char c;
int x;
} __attribute__((packed));
struct foo arr[2] = { { 'a', 10 }, {'b', 20 } };
int *p0 = &arr[0].x;
int *p1 = &arr[1].x;
printf("sizeof(struct foo) = %d\n", (...
I don't understand -Wl,-rpath -Wl,
...g. You may need to specify the -L option as well - eg
-Wl,-rpath,/path/to/foo -L/path/to/foo -lbaz
or you may end up with an error like
ld: cannot find -lbaz
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The property 'value' does not exist on value of type 'HTMLElement'
...ent. Similarly in statically typed Java this won't compile:
public Object foo() {
return 42;
}
foo().signum();
signum() is a method of Integer, but the compiler only knows the static type of foo(), which is Object. And Object doesn't have a signum() method.
But the compiler can't know that, i...
How to define a function in ghci across multiple lines?
...rect, but :{ and :} must each appear on their own line:
> :{
> let foo a b = a +
> b
> :}
> :t foo
foo :: (Num a) => a -> a -> a
This also interacts with the layout rule, so when using do-notation it might be easier to use braces and semi-colons explicitly. For ...
How to make MySQL handle UTF-8 properly
...and the table.
You can have a look (MySQL commands):
show create database foo;
> CREATE DATABASE `foo`.`foo` /*!40100 DEFAULT CHARACTER SET latin1 */
show create table foo.bar;
> lots of stuff ending with
> ) ENGINE=InnoDB AUTO_INCREMENT=252 DEFAULT CHARSET=latin1
In other words; it's...