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50 lines
1.2 KiB
Markdown
50 lines
1.2 KiB
Markdown
## Iteration
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Better Enums makes it easy to iterate over the values you have declared. For
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example, this:
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#include <iostream>
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#include <enum.h>
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<em>ENUM(Channel, int, Red, Green = 2, Blue)</em>
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int main()
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{
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<em>for</em> (<em>size_t index = 0</em>; <em>index < Channel::_size</em>; <em>++index</em>) {
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Channel channel = <em>Channel::_values()[index]</em>;
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std::cout << channel._to_integral() << " ";
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}
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std::cout << std::endl;
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will print "0 2 3". And this:
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<em>for</em> (<em>size_t index = 0</em>; <em>index < Channel::_size</em>; <em>++index</em>) {
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const char *name = <em>Channel::_names()[index]</em>;
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std::cout << name << " ";
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}
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std::cout << std::endl;
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will print "Red Green Blue".
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---
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If you are using $cxx11, you can have much nicer syntax:
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~~~comment
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<em>for (Channel channel : Channel::_values())</em>
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std::cout << <em>channel._to_integral()</em> << " ";
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std::cout << std::endl;
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<em>for (const char *name : Channel::_names())</em>
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std::cout << <em>name</em> << " ";
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std::cout << std::endl;
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~~~
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---
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return 0;
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}
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%% description = Iterating over all Better Enums constants.
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