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App Inventor 2 中文网 · 升级日志
...、 MQTT、 ClientSocket 拓展文档及翻译。 230516 2023/05/16 优化 启用HSTS（HTTP Strict Transport Security）安全机制。 升级 启用 h2（HTTP 2.0）协议。 230418 2023/04/18 新增 公安备案通过，...
How to change the default GCC compiler in Ubuntu?
... this way, but it still uses g++-7 standard libraries, and now i'm getting errors with undefined __builtin stuff.
– Youda008
May 1 '19 at 8:17
add a comment
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How to create circle with Bézier curves?
...are on the circle, and that the first derivative is continuous.
The radial error in this approximation will be about 0.0273% of the
circle's radius.
Michael Goldapp, "Approximation of circular arcs by cubic
polynomials" Computer Aided Geometric Design (#8 1991 pp.227-238)
Tor Dokken and Morten Da...
Count table rows
... COUNT(*) is a strict language definition. You will get a parse error if you try COUNT (*) note the space
– ppostma1
Jun 23 '14 at 18:30
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Test if a variable is set in bash when using “set -o nounset”
The following code exits with a unbound variable error. How to fix this, while still using the set -o nounset option?
6 A...
How to configure Ruby on Rails with no database?
...rage.service = :local # For Rails >= 5.2
config.active_record.migration_error = :page_load
config.active_record.verbose_query_logs = true
# config/environments/test.rb
config.active_storage.service = :test # For Rails >= 5.2
# config/environments/production.rb
config.active_storage.service =...
How do I revert a Git repository to a previous commit?
...one of the commits between 0766c053..HEAD is a merge then there will be an error popping up (to do with no -m specified). This may help those encountering that: stackoverflow.com/questions/5970889/…
– timhc22
Nov 21 '14 at 11:55
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Binding a WPF ComboBox to a custom list
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answered Oct 11 '16 at 15:05
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How to specify a editor to open crontab file? “export EDITOR=vi” does not work
I'm using Red Hat Enterprise Linux 5, and I want to set the vim editor to edit the crontab file.
8 Answers
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Removing fields from struct or hiding them in JSON Response
...ucta interface{},
includeFields map[string]bool) (jsona []byte, status error) {
value := reflect.ValueOf(structa)
typa := reflect.TypeOf(structa)
size := value.NumField()
jsona = append(jsona, '{')
for i := 0; i < size; i++ {
structValue := value.Field(i)
v...