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Why did the designers of ColdFusion decide to index arrays from 1 rather than 0?

由 微笑、不失礼 提交于 2019-12-14 03:45:02
问题 I'm just curious about this really, does anyone know why they broke convention on this one? Thanks, Ciaran 回答1: @Cory: You'd be surprised to know who lurking on StackOverflow. :-) You are very much right. The original design of CFML was to allow non-programmers to build complex web applications. ColdFusion\CFML was the first language designed specifically for building web applications. Back in 1995 the web was mostly static HTML and your typical 'web developer' wasn't doing too much

Why is C++ backward compatible with C ? Why isn't there some “pure” C++ language?

由 ﹥＞﹥吖頭↗ 提交于 2019-12-14 03:43:26
问题 C and C++ are different languages, blababla we know that. But if those language are different, why is it still possible to use function like malloc or free ? I'm sure there are all sort of dusty things C++ has because of C, but since C++ is another language, why not remove those things to make it a little less bloat and more clean and clear ? Is it because it allows programmers to work without the OO model or because some compilers doesn't support high-level abstract features of C++ ? 回答1:

What is the reason for having unreserved identifiers as built-in macros in gcc?

由 妖精的绣舞 提交于 2019-12-13 12:23:33
问题 Today I stumbled upon a rather interesting compiler error: int main() { int const unix = 0; // error-line return unix; } Gives the following message with gcc 4.3.2 (yes, ancient...): error: expected unqualified-id before numeric constant which is definitely quite confusing. Fortunately, clang (3.0) is a little more helpful (as usual): error: expected unqualified-id int const unix = 0 ^ <built-in>:127:14: note: expanded from: #define unix 1 ^ I certainly did not expect unix , which is neither

Storing the edit history of a django model in another custom model

由 烈酒焚心 提交于 2019-12-13 12:09:28
问题 I have two models lets say: class superfields(Model): fieldA = models.FloatField() fieldB = models.FloatField() class Meta: abstract = True class my_model( superfields ): def has_history( self ): return self.my_model_history_set.count() > 0 class my_model_history( superfields ): reason = models.TextField() mymodel = models.ForeignKey( my_model ) 'my_model' is populated with data (under fieldA and fieldB). Whenever someone edits 'my_model's fields and saves, I don't want to save the change in

zabbix的数据库优化

由 前提是你 提交于 2019-12-13 08:46:45
走zabbix的1.6版本开始测试，1.8的版本开始线上使用，线上使用过1.9、2.0、2.2、3.0、4.0的版本，使用或是测试过zabbix1.6之后的所有版本。个人也有之前的SA转变为DBA，就zabbix的运维走数据库层面有一些自己的心得，希望对读者有所帮助。 1：MySQL版本推荐 MySQL5.7及以上版本，便捷的在线DDL方便zabbix的快速升级 链接数据库方式：zabbix的server、proxy、MySQL数据库尽量使用域名方式连接，方便进行故障切换。 2：zabbix数据库的授权 读写权限，用作zabbix自身访问： grant all privileges on zabbix. to 'zabbix'@'1.1.1.1' identified by 'zabbix'; 只读权限，用作二次开发只读zabbix数据库： grant SELECT on zabbix. to 'zabbix_ro'@'1.1.1.1' identified by 'zabbixro'; 3：MySQL配置文件需要调整的几个重要参数 innodb_log_files_in_group = 16 innodb_log_file_size = 1G innodb_file_per_table = 1 max_allowed_packet = 64M back_log = 1024

How can a patchfile created with `git-log -p <filename>` be applied to create all the commits included?

由 强颜欢笑 提交于 2019-12-13 07:29:41
问题 Background: this question. git apply <patchfile> just recreates the file but without committing the history, which in this case would be desireable. Is there any switch for git-apply to do so? Or is there a way to convert the patchfile into a git-am compatible file? (Currently, git-am complains "Patch format detection failed") 回答1: You asked, so here it is. I used this script, but it's all rather fragile. Treat it an as inspiration, not as a reasonable solution. It extracts (date / author /

How do I cat revisions of a file, following it through renames?

由 断了今生、忘了曾经 提交于 2019-12-13 06:26:33
问题 I can do this just fine: git log --format=%h -- filename | while read f; do git show $f:filename; done However, if I try to add --follow to the git log call, the file moves through directories and changes names, so the git show call fails on the path change. I've tried inserting various things to grab the full path ( fullname=`ls-tree --name-only $f -- filename` , etc.) and passing it on to git show , but nothing's working, and I'm not finding much with google and SO searches. I feel like I'm

Android: Clear Activity History

由 自作多情 提交于 2019-12-13 04:58:56
问题 I've faced with one problem - clearing activity history. I have the following consequence where my problem appears: A(SplashScreen)->B(GuestScreen)->C(Screen for signed users)->Press Home Button->A->B->Press Back Button->C->Press Back BUtton->B->Press Back Button->exit from the app. I tried different ways to solve it and found only one quite strange solution throughout setting almost all activities to singleInstance and setting all intent flags to CLEAR_TOP and NEW_TASK but all activities are

Best approach to optimize a record history database

由 狂风中的少年 提交于 2019-12-13 01:56:09
问题 I have a database that keeps record history. For each update to a record, the system will "deactivate" the previous record (along with all it's children), by setting the "Status" column to "0". Now it's not a problem yet...but eventually this system is going to have a lot of records, and history is more important than speed right now. But the more records inserted, the slower searches become. What is the best approach to archive the records? I've had suggestions to create a cloned archive

Why in interpreted languages the # usually introduces a comment?

由 南楼画角 提交于 2019-12-12 18:09:34
问题 Why in interpreted languages the # normally introduces a comment? This question was asked in an exam on Shell Programming but I don't find any hint on why it's the #. Any ideas? 回答1: make uses the #-comment construct; and sh, one the first shells, uses the same #-comment. The writers of later shells -- csh, ksh, bash, jsh, and more -- understood that it would be a burden on users if each were to have its own comment convention, particularly since all of these shell scripts can sort-of run
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