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https://github.com/aantron/better-enums.git
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2acb5743fa
The documentation is now generated from markdown. Samples are generated from the tutorial pages. Testing is done by a Python script which runs the tests for a large number of compilers. This version is not very developer-friendly - the Python scripts need ways of limiting what compilers they try to run. If you don't have 15 compilers installed, you won't be able to run the tests in this commit. Fix coming soon.
47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
// This file was generated automatically
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// Compile-time usage
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//
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// When used with $cxx11, Better Enums are generated entirely during
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// compilation. All the data is available for use by your own constexpr
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// functions. The examples in <em>this</em> tutorial aren't very useful, but
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// read the following tutorials to get an idea of what can be done. Here, you
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// will see the basics.
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#include <iostream>
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#ifndef BETTER_ENUMS_CONSTEXPR_TO_STRING
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#define BETTER_ENUMS_CONSTEXPR_TO_STRING
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#endif
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#include <enum.h>
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ENUM(Channel, int, Red = 1, Green = 2, Blue = 3)
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constexpr Channel channel = Channel::Green;
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constexpr int value = channel._to_integral();
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constexpr const char *name = channel._to_string();
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constexpr Channel parsed = Channel::_from_string("Red");
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// All of the above are computed during compilation. You can do apparently
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// useless things such as:
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constexpr size_t length(const char *s, size_t index = 0)
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{
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return s[index] == '\0' ? index : length(s, index + 1);
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}
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constexpr size_t length_of_name_of_second_constant =
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length(Channel::_names()[1]);
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int main()
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{
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std::cout << length_of_name_of_second_constant << std::endl;
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return 0;
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}
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// Which prints "5", the length of "Green". That 5 was also computed during
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// compilation.
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