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Why use #ifndef CLASS_H and #define CLASS_H in .h file but not in .cpp?
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First, to address your first inquiry:
When you see this in .h file:
#ifndef FILE_H
#define FILE_H
/* ... Declarations etc here ... */
#endif
This is a preprocessor technique of preventing a header file from being included multiple times, which can be problematic for various reasons...
Staging Deleted files
Say I have a file in my git repository called foo .
9 Answers
9
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Java FileOutputStream Create File if not exists
Is there a way to use FileOutputStream in a way that if a file (String filename) does not exist, then it will create it?
9 ...
How can I get a resource “Folder” from inside my jar File?
...folder/package in the root of my project, I "don't" want to load a certain File. If I wanted to load a certain File, I would use class.getResourceAsStream and I would be fine!! What I actually want to do is to load a "Folder" within the resources folder, loop on the Files inside that Folder and get ...
read complete file without using loop in java
I am trying to read the contents of a file using FileReader . But i want to read the file without reading a line by line . Is it possible to read the whole file without loop.
I am using the following code
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How to add an auto-incrementing primary key to an existing table, in PostgreSQL?
...le named test1, to which you want to add an auto-incrementing, primary-key id (surrogate) column. The following command should be sufficient in recent versions of PostgreSQL:
ALTER TABLE test1 ADD COLUMN id SERIAL PRIMARY KEY;
Older Versions of PostgreSQL
In old versions of PostgreSQL (prior ...
Create unique constraint with null columns
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Create two partial indexes:
CREATE UNIQUE INDEX favo_3col_uni_idx ON favorites (user_id, menu_id, recipe_id)
WHERE menu_id IS NOT NULL;
CREATE UNIQUE INDEX favo_2col_uni_idx ON favorites (user_id, recipe_id)
WHERE menu_id IS NULL;
This way, there can only be one combination of (user_...
Disable a Maven plugin defined in a parent POM
...or me when disabling Findbugs in a child POM:
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>findbugs-maven-plugin</artifactId>
<executions>
<execution>
<id>ID_AS_IN_PARENT</id> <!-- id is necessary ...
How do I iterate through the files in a directory in Java?
I need to get a list of all the files in a directory, including files in all the sub-directories. What is the standard way to accomplish directory iteration with Java?
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Send file using POST from a Python script
Is there a way to send a file using POST from a Python script?
8 Answers
8
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