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Why doesn't Java allow generic subclasses of Throwable?
...:
class ParametricException<T> extends Exception { // compile-time error
private final T value;
public ParametricException(T value) { this.value = value; }
public T getValue() { return value; }
}
An attempt to compile the above reports an error:
% javac ParametricException.java
Para...
Why can templates only be implemented in the header file?
...iations are referred to from other .cpp files, and I still get the linking error that the members are not found.
– oarfish
Sep 4 '19 at 14:38
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Optimise PostgreSQL for fast testing
...ds on what else is going on with your machine, and requires some trial and error. The defaults are extremely conservative. You may need to increase the OS's maximum shared memory limit if you increase shared_buffers on PostgreSQL 9.2 and below; 9.3 and above changed how they use shared memory to avo...
Locking pattern for proper use of .NET MemoryCache
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While its true that Lazy<T> can return an error if the initialization exception fails, that is a pretty easy thing to detect. You can then evict any Lazy<T> that resolves to an error from the cache, create a new Lazy<T>, put that in the cache, and resolve...
A migration to add unique constraint to a combination of columns
... unique: true
Trying to create two similar records will throw a database error (Postgres in my case):
ActiveRecord::RecordNotUnique: PG::UniqueViolation: ERROR: duplicate key value violates unique constraint "index_ownerships_on_user_id_and_post_id"
DETAIL: Key (user_id, post_id)=(1, 1) already...
Prepend a level to a pandas MultiIndex
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This is especially nice for adding a level to the columns by adding axis=1, since the df.columns doesn't have the "set_index" method like the index, which always bugs me.
– Rutger Kassies
Feb 10 '17 a...
How do I add a new sourceset to Gradle?
... sourceSet enhancements without configurations or output results in a make error in idea after initally opening a project. the build dependency (here: test) for the new "module" (here: integrationTest) isn't available upon first compileTestJava
– childno͡.de
A...
Mozilla PDF.js：PDF在线预览 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...What browsers are supported?支持哪些浏览器?
The goal is to support all HTML5 compliant browsers, but sincefeature support varies per browser/version our support for all PDF featuresvaries as well. If you want to support more browsers than Firefox you'll needto include compatibility.jswhich h...
Visual Studio: How to “Copy to Output Directory” without copying the folder structure?
...perfectly except for one dll that I am not able to add as a reference. The error I get while adding as reference is A reference to 'libeay32.dll' could not be added. Please make sure that the file is accessible, and that it is a valid assembly or COM component.
– OhDear
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Getting file names without extensions
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I got the error " 'builder' does not exist in the current context ". I added 'system.Text' but still got same error. What is the reason?
– ffttyy
Jan 27 '16 at 19:52
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