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ActiveRecord: size vs count
...e a new record without going through the relation, i.e. Comment.create(post_id: post.id), your post.comments.size will not be up to date, while post.comments.count will. So just be careful.
– mrbrdo
Mar 31 '13 at 19:52
...
How to drive C#, C++ or Java compiler to compute 1+2+3+…+1000 at compile time?
...t;unsigned Cur, unsigned Goal>
struct adder{
static unsigned const sub_goal = (Cur + Goal) / 2;
static unsigned const tmp = adder<Cur, sub_goal>::value;
static unsigned const value = tmp + adder<sub_goal+1, Goal>::value;
};
template<unsigned Goal>
struct adder<Goal, Go...
Creating a new user and password with Ansible
...ss
user:
name: {{ uusername }}
password: {{ upassword | password_hash('sha512') }}
groups: admin append=yes
when: assigned_role == "yes"
- name: Creating users "{{ uusername }}" without admin access
user:
name: {{ uusername }}
password: {{ upassword | password_hash('sha...
Why does Oracle 9i treat an empty string as NULL?
...
docs.oracle.com/cd/B19306_01/server.102/b14200/…
– Walter Mitty
Oct 16 '18 at 0:29
add a comment
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Error “gnu/stubs-32.h: No such file or directory” while compiling Nachos source code
...e files in a non standard location. You'll also need to do:
export LIBRARY_PATH=/usr/lib/$(gcc -print-multiarch)
export C_INCLUDE_PATH=/usr/include/$(gcc -print-multiarch)
export CPLUS_INCLUDE_PATH=/usr/include/$(gcc -print-multiarch)
somewhere before you build (say in your .bashrc).
If you ar...
VC MFC工具栏(CToolBar)控件 - C/C++ - 清泛网 - 专注C/C++及内核技术
...钮吧，首先在对应话类里添加一个按钮类成员变量CButton m_Button;
然后在对话框编辑区里给对话框添加一个按钮控件（单击这个按钮创建按钮控件）,然后添加这个按钮控件单击消息处理函数，并在函数添加以下语句：
RECT ButtonR...
How to calculate the CPU usage of a process by PID in Linux from C?
...rocess
pgrp pgrp of the process
sid session id
tty_nr tty the process uses
tty_pgrp pgrp of the tty
flags task flags
min_flt number of minor faults
cmin_flt number of minor faults with child's
maj_flt number of major faults
cm...
How can I randomize the lines in a file using standard tools on Red Hat Linux?
... to Jim's answer:
My ~/.bashrc contains the following:
unsort ()
{
LC_ALL=C sort -R "$@"
}
With GNU coreutils's sort, -R = --random-sort, which generates a random hash of each line and sorts by it. The randomized hash wouldn't actually be used in some locales in some older (buggy) versions,...
Where is the C auto keyword used?
...
The page linked is outdated. Since C11, there's also _Thread_local details: en.cppreference.com/w/c/language/storage_duration and stackoverflow.com/a/14289720/6557621
– MCCCS
Jun 7 '18 at 16:02
...
Receiving login prompt using integrated windows authentication
...upport article to fix the issue:
https://webconnection.west-wind.com/docs/_4gi0ql5jb.htm (original, now defunct: http://support.microsoft.com/kb/896861)
From the support article, to ensure it doesn't get lost:
The work around is a registry hack that disables this policy
explicitly.
To p...