CODEWITHSUNDEEP
c++c++20
user15924460
user15924460

Reputation: 19

can i include a file whose path is from a string variable?

i think in python:

i can use:

def include_something(s):
  exec('import %s'%(s))

to import package dynamically

but in c++:

void include_something(const std::string& v) {
  # include v.c_str();
}

seems doestnt work.

So, is there any methods can do this? and will the futures c++ support this kind of function?

Upvotes: 0

Views: 439

Answers (2)

Sourabh
Sourabh

Reputation: 190

There is no way in C/C++ to achieve dynamic header loading.

BUT

I'll do as the following:

Create a simple PowerShell script to create a master header file, that will contain all the headers from a given directory.

$source_dir = "C:\Program Files (x86)\Windows Kits\10\Include\10.0.14393.0\um\alljoyn_c\"
$master_headerfile = 'master.h'

Remove-Item $master_headerfile

New-Item $master_headerfile -ItemType File -Value "// Master header file`n"

Get-ChildItem $source_dir -Filter *.h |
Foreach-Object {

    Add-Content $master_headerfile "#include `"$_`""

}

Output will be enter image description here

Now just include this master.h in your source file.

I hope, it will help you.

Thanks :)

Upvotes: 0

Deumaudit
Deumaudit

Reputation: 1016

Simple answer: No, You can't

Answer with details: You can't do this with either include or import. As You can see on the picture below, include works on preprocess time, and import works on precompile time. While c_str is running at compile time (if it is constexpr), or at run time (if casual class or function), therefore, in any case, the import(or include) will be completed before the program learns the name of the module compilation process source of image

Upvotes: 2

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