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When can I use a forward declaration?
...an incomplete type:
Use it as a base class
class Foo : X {} // compiler error!
Use it to declare a member:
class Foo {
X m; // compiler error!
};
Define functions or methods using this type
void f1(X x) {} // compiler error!
X f2() {} // compiler error!
Use its methods or fields, i...
Change auto increment starting number?
...do this!
– h00ligan
Dec 5 '14 at 14:05
16
To clarify: Setting the initial value to 5, means that ...
Automatic exit from bash shell script on error [duplicate]
...e -u -x and -o pipefail options like so:
set -euxo pipefail
-e exits on error, -u errors on undefined variables, and -o (for option) pipefail exits on command pipe failures. Some gotchas and workarounds are documented well here.
(*) Note:
The shell does not exit if the command that fails is ...
Why 0 is true but false is 1 in the shell?
...ts you can check pretty easily for success, and investigate the particular error for more details if you want to. A lot of APIs and frameworks have a similar convention - functions that succeed return 0 and and those that fail give back an error code describing the particular failure case.
...
What is an “unwrapped value” in Swift?
... the second two cases is that the second two cases will give you a runtime error if optionalSquare is set to nil. Using the syntax in the first case, you can do something like this:
if let sideLength = optionalSquare?.sideLength {
println("sideLength is not nil")
} else {
println("sidelengt...
mysql error 1364 Field doesn't have a default values
...emoving strict_trans_table sql mode makes MySQL more prone to data quality errors, so removing it is not a really good advice.
– Shadow
May 18 '17 at 8:59
...
Git - How to fix “corrupted” interactive rebase?
...ow every access to the .git\rebase-merge folder caused an "Access denied" -error.
– Mikael Koskinen
Sep 13 '10 at 5:07
20
...
How to solve “Plugin execution not covered by lifecycle configuration” for Spring Data Maven Builds
... <pluginManagement> tag to the pom.xml in question. Looks like that error is due to a missing <pluginManagement> tag. So, in order to avoid the exceptions in Eclipse, one needs to simply enclose all the plugin tags inside a <pluginManagement> tag, like so:
<build>
<...
When should an IllegalArgumentException be thrown?
...o the works and cause something to fail halfway through with a nonsensical error message.
It's used for cases where it would be too annoying to throw a checked exception (although it makes an appearance in the java.lang.reflect code, where concern about ridiculous levels of checked-exception-throwi...
Getting “type or namespace name could not be found” but everything seems ok?
...erence full framework targeted assembly).
Note that you can also get this error when you create a new project in VS2012 or VS2013 (which uses .Net 4.5 as the default framework) and:
the referencing project(s) use .Net 4.0 (this is common when you have migrated from VS2010 to VS2012 or VS2013 an...