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How to Set Opacity (Alpha) for View in Android
...a));
setHintTextColor(getHintTextColors().withAlpha(alpha));
setLinkTextColor(getLinkTextColors().withAlpha(alpha));
return true;
}
}
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Why do I get a warning every time I use malloc?
...n for the built-in function malloc. If you don't do that, the compiler thinks you want to define your own function named malloc and it warns you because:
You don't explicitly declare it and
There already is a built-in function by that name which has a different signature than the one that was impl...
lua和c/c++互相调用实例分析 - C/C++ - 清泛网 - 专注C/C++及内核技术
...L, int idx);
void (lua_replace) (lua_State *L, int idx);
int (lua_checkstack) (lua_State *L, int sz);
lua中定义的变量和函数存放在一个全局table中，索引值为LUA_GLOBALSINDEX ，table相关操作接口：
void (lua_gettable) (lua_State *L, int idx);
void (lua_getfield) ...
Create a pointer to two-dimensional array
...
Here you wanna make a pointer to the first element of the array
uint8_t (*matrix_ptr)[20] = l_matrix;
With typedef, this looks cleaner
typedef uint8_t array_of_20_uint8_t[20];
array_of_20_uint8_t *matrix_ptr = l_matrix;
Then you can enj...
How do I use define_method to create class methods?
...
I think in Ruby 1.9 you can do this:
class A
define_singleton_method :loudly do |message|
puts message.upcase
end
end
A.loudly "my message"
# >> MY MESSAGE
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How to express a NOT IN query with ActiveRecord/Rails?
...s since it seems a lot of people come to this, if you are using Rails 4 look at the answers by Trung Lê` and VinniVidiVicci.
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dplyr summarise: Equivalent of “.drop=FALSE” to keep groups with zero length in output
...n change this behavior by adding .drop = FALSE . However, this doesn't work when using summarise with dplyr . Is there another way to keep empty categories in the result?
...
AngularJS ngClass conditional
Is there any way to make an expression for something like ng-class to be a conditional?
11 Answers
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How do I get out of a screen without typing 'exit'?
...
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How do you detect where two line segments intersect? [closed]
...in opposite directions, then s · r < 0 and so the interval to be checked is [t1, t0] rather than [t0, t1].
If r × s = 0 and (q − p) × r ≠ 0, then the two lines are parallel and non-intersecting.
If r × s ≠ 0 and 0 ≤ t ≤ 1 and 0 ≤ u ≤ 1, the two line segme...