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The C Preprocessor

Working with Header FilesConditional Compilation
Defining Macros

SymbolicC has a number of functions for working with the C preprocessor. These allow you to set up including header files, defining macros, as well as setting up conditional compilation.

Working with Header Files

First, you need to load the package.

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In[1]:=1
✖
https://wolfram.com/xid/0cy0h027a4nid2n19qn3zw2-htgvfm
Direct link to example

Now you can include a header file with CInclude.

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In[2]:=2
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https://wolfram.com/xid/0cy0h027a4nid2n19qn3zw2-fsvapo
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Out[2]=2

If it is a system header file, this is dealt with appropriately.

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In[3]:=3
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https://wolfram.com/xid/0cy0h027a4nid2n19qn3zw2-hg9acp
Direct link to example
Out[3]=3

You can add a list of header files in one CInclude expression.

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In[4]:=4
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https://wolfram.com/xid/0cy0h027a4nid2n19qn3zw2-j4jot6
Direct link to example
Out[4]=4

It is also possible to use CComment to add a comment to an include statement.

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In[5]:=5
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https://wolfram.com/xid/0cy0h027a4nid2n19qn3zw2-bdur2q
Direct link to example
Out[5]=5

Defining Macros

You can define a macro using CDefine.

First, you need to load the package.

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In[1]:=1
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https://wolfram.com/xid/0cy0h027a4nid2n19qn3zw2-eotvx1
Direct link to example

Now you can define a macro.

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In[2]:=2
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https://wolfram.com/xid/0cy0h027a4nid2n19qn3zw2-gcl80h
Direct link to example
Out[2]=2

You can combine the definition with other SymbolicC functions.

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In[3]:=3
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https://wolfram.com/xid/0cy0h027a4nid2n19qn3zw2-o736wi
Direct link to example
Out[3]=3

You can also add a comment by adding a CComment expression.

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In[4]:=4
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https://wolfram.com/xid/0cy0h027a4nid2n19qn3zw2-wmv75
Direct link to example
Out[4]=4

Conditional Compilation

There are a range of functions to create C preprocessor conditional compilation output.

First, you need to load the package.

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In[1]:=1
✖
https://wolfram.com/xid/0cy0h027a4nid2n19qn3zw2-063iw
Direct link to example

Now you can create a conditional compilation output.

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In[2]:=2
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https://wolfram.com/xid/0cy0h027a4nid2n19qn3zw2-jplb99
Direct link to example
Out[2]=2

You can also add an entire command.

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In[3]:=3
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https://wolfram.com/xid/0cy0h027a4nid2n19qn3zw2-f3n3me
Direct link to example
Out[3]=3

CPreprocessorIfdef can create an entire sequence.

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In[4]:=4
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https://wolfram.com/xid/0cy0h027a4nid2n19qn3zw2-ht7uw
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Out[4]=4

The conditional compilation output commands are summarized in the following table.

CPreprocessorIf#if a == 1
CPreprocessorIfdef#ifdef DEBUG
CPreprocessorIfndef#ifndef DEBUG
CPreprocessorElse#else
CPreprocessorElif#elif b
CPreprocessorEndif#endif

C preprocessor conditional compilation output.