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emacs/elisp: What is the hash (pound, number sign, octothorp) symbol used for?
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There is no difference:
(eq 'my-add #'my-add)
yields t
The # can be used in front of a lambda expression indicating to the byte-compiler that the following expression can be byte compiled, see the docs for Anonymous Functions. But there's nothing to compile in the case of a symbol.
I...
Pragma in define macro
..._Pragma("argument")
which is equivalent to
#pragma argument
except it can be used in macros (see section 6.10.9 of the c99 standard, or 16.9 of the c++0x final committee draft)
For example,
#define STRINGIFY(a) #a
#define DEFINE_DELETE_OBJECT(type) \
void delete_ ## t...
How to safely open/close files in python 2.4
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See docs.python.org:
When you’re done with a file, call f.close() to close it and free up any system resources taken up by the open file. After calling f.close(), attempts to use the file object will automatically fail.
Hence use close() elegantly with try/finally:
f = ope...
Turning Sonar off for certain code
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This is a FAQ. You can put //NOSONAR on the line triggering the warning. I prefer using the FindBugs mechanism though, which consists in adding the @SuppressFBWarnings annotation:
@edu.umd.cs.findbugs.annotations.SuppressFBWarnings(
value ...
Convert JsonNode into POJO
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In Jackson 2.4, you can convert as follows:
MyClass newJsonNode = jsonObjectMapper.treeToValue(someJsonNode, MyClass.class);
where jsonObjectMapper is a Jackson ObjectMapper.
In older versions of Jackson, it would be
MyClass newJsonNode =...
intellij - spring is not being recognized (Unmapped Spring configuration)
...hirishreddy It seemed to work a bit patchily for me. We had multiple application contexts for different testing setups though
– JonnyRaa
Feb 6 '15 at 9:12
add a comment
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Editing legend (text) labels in ggplot
...Overflow, but no solution seems to solve my problem. When using ggplot I can't get the right text in the legend, even though it's in my dataframe. I have tried scale_colour_manual , scale_fill_manual with different values for labels= such as c("T999", "T888")", "cols" .
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Makefile经典教程（入门必备） - C/C++ - 清泛网移动版 - 专注IT技能提升
...，如：tar、awk、mail、sed、cvs、compress、ls、rm、yacc、rpm、 ftp……等等，等等，来完成诸如"程序打包"、"程序备份"、"制作程序安装包"、"提交代码"、"使用程序模板"、"合并文件"等等五花八门的功能，文件操作，文件管理，编程开...
Makefile经典教程（入门必备） - C/C++ - 清泛网移动版 - 专注IT技能提升
...，如：tar、awk、mail、sed、cvs、compress、ls、rm、yacc、rpm、 ftp……等等，等等，来完成诸如"程序打包"、"程序备份"、"制作程序安装包"、"提交代码"、"使用程序模板"、"合并文件"等等五花八门的功能，文件操作，文件管理，编程开...
Makefile经典教程（入门必备） - C/C++ - 清泛网移动版 - 专注IT技能提升
...，如：tar、awk、mail、sed、cvs、compress、ls、rm、yacc、rpm、 ftp……等等，等等，来完成诸如"程序打包"、"程序备份"、"制作程序安装包"、"提交代码"、"使用程序模板"、"合并文件"等等五花八门的功能，文件操作，文件管理，编程开...