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How to disallow temporaries
...w can you know that it is source compatible with existing code? His friend includes his header and has void f() { int Foo = 0; } which previously compiled fine and now miscompiles! Also, every line that defines a member function of class Foo fails: void class Foo::bar() {}")
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What is the difference between application server and web server?
... protocols, the application server deals with several different protocols, including, but not limited, to HTTP.
The Web server's main job is to display the site content and the application server is in charge of the logic, the interaction between the user and the displayed content. The application s...
Implementing MVC with Windows Forms
...different from each other. Some of the design differences I have seen are (including most combinations):
Directly talk to the database (2 tier)
Use a backend that has been written for the given application (3 tier)
Use a set of web services that were written for use by many applications and can’...
Web-scraping JavaScript page with Python
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Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
...z
cd postfix-2.9.1
make makefiles 'CCARGS=-DHAS_MYSQL -I/usr/local/mysql/include -DUSE_SASL_AUTH -DUSE_CYRUS_SASL -I/usr/include/sasl -DUSE_TLS ' 'AUXLIBS=-L/usr/local/mysql/lib -lmysqlclient -lz -lm -L/usr/lib/sasl2 -lsasl2 -lssl -lcrypto'
make
make install
说明：在执行make makefiles...
git undo all uncommitted or unsaved changes
...ain:
git clean -fdx
WARNING: -x will also remove all ignored files, including ones specified by .gitignore! You may want to use -n for preview of files to be deleted.
To sum it up: executing commands below is basically equivalent to fresh git clone from original source (but it does not r...
How do you find all subclasses of a given class in Java?
...ider = new ClassPathScanningCandidateComponentProvider(false);
provider.addIncludeFilter(new AssignableTypeFilter(MyClass.class));
// scan in org.example.package
Set<BeanDefinition> components = provider.findCandidateComponents("org/example/package");
for (BeanDefinition component : component...
How to check if a model has a certain column/attribute?
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For a class
Use Class.column_names.include? attr_name where attr_name is the string name of your attribute.
In this case: Number.column_names.include? 'one'
For an instance
Use record.has_attribute?(:attr_name) or record.has_attribute?('attr_name') (Rails 3...
How can I read a function's signature including default argument values?
Given a function object, how can I get its signature? For example, for:
8 Answers
8
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Using -performSelector: vs. just calling the method
...mpile the code.
One key difference is that -performSelector: and friends (including the multi-threaded and delayed variants) are somewhat limited in that they are designed for use with methods with 0-2 parameters. For example, calling -outlineView:toolTipForCell:rect:tableColumn:item:mouseLocation:...