where to write the #include at h or at cpp file

[tonnot]

Or not matter?
Where is the correct place to write #include <bla bla>?
At .h file or .cpp file ? or both ?
Thank you

[thecodewall]

it's nice to post in .h file, because .h is what to be included in all your .cpp files, so you don't have repeat all the #includes in .cpp files.

http://codewall.blogspot.com

[tonnot]

Thanks

[coder777]

tonnot wrote:

At .h file or .cpp file ? or both ?

place it where it's needed. Sometimes the order of the includes matters. Mind you that when you change something in a header file that's included like everywhere all that dependend files are compiled as well. Large projects do have their problems with that.

[ne555]

coder777 wrote:

Sometimes the order of the includes matters

Could you give me an example? It doesn't sound right.

[Disch]

The order matters only if the headers are written poorly.

You should only include what's necessary in the header.

tonnot: read section 4, "The Right Way To Include":

http://www.cplusplus.com/forum/articles/10627/#msg49679