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# cxxcodebuilder: generate C/C++ code with a Builder-style DSL
Cxxcodebuilder gives you a simple Ruby API for programmatically outputting C/C++ code with proper indenting and formatting. Code using this API is much more readable than code building raw strings. Cxxcodebuilder is similar to [Jbuilder](https://github.com/rails/jbuilder), which is for outputting JSON.
## Use cases
This library is useful in build systems for automatically generating C/C++ code. It is much cleaner compared to using ERB or other generic text templating systems for the job.
## Example
Suppose that you want to write the following piece of code:
~~~c++
#include <stdio.h>
static int limit = 0;
static int magicNumbers[] = [1, 2, 3];
static Foo foos[] = [
{ "hello", 1 },
{ "world", 2 }
];
/*
* This is an awesome model
* for a futuristic car.
*/
struct Car {
unsigned int seats;
};
static int
modifyLimit(int diff) {
int oldLimit = limit;
limit += diff;
printf("The new limit is: %s\n", limit);
return oldLimit;
}
~~~
Use Cxxcodebuilder as follows:
~~~ruby
require 'cxxcodebuilder'
builder = CxxCodeBuilder::Builder.new do
include '<stdio.h>'
separator
field 'static int limit', 0
field 'static int magicNumbers[]' do
array_initializer do
element 1
element 2
element 3
end
end
field 'static Foo foo[]' do
array_initializer do
struct_element do
string_element 'hello'
element 1
end
struct_element do
string_element 'world'
element 2
end
end
end
separator
comment %q{
This is an awesome model
for a futuristic car.
}
struct 'Car' do
field 'unsigned int seats'
end
separator
function('static int modifyLimit(int diff)', %q{
int oldLimit = limit;
limit += diff;
printf("The new limit is: %s\n", limit);
return oldLimit;
})
end
puts(builder)
~~~
## API
See the comments in lib/cxxcodebuilder/builder.rb for the full API.