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https://github.com/aantron/better-enums.git
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832dad561f
These modifications ensure enum.h can be used in a wider selection of end user projects without triggering warnings. GCC 4.9.2 was used with the following warning flags set: -Wall -Wextra -Wshadow -Weffc++ -Wno-unused-parameter -Wno-unused-local-typedefs -Wno-long-long -Wstrict-aliasing -Werror -pedantic -std=c++1y -Wformat=2 -Wmissing-include-dirs -Wsync-nand -Wuninitialized -Wconditionally-supported -Wconversion -Wuseless-cast -Wzero-as-null-pointer-constant This commit includes the modifications required to enable successful use of enum.h via both the "test" and "example" directories.
45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
// Usage with std::bitset.
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#include <bitset>
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#include <iostream>
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#include <enum.h>
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// Computes the maximum value of an enum at compile time.
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template <typename Enum>
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constexpr Enum maximum(Enum accumulator = Enum::_values[0], size_t index = 1)
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{
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return
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index >= Enum::_size ? accumulator :
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+Enum::_values[index] > accumulator ?
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maximum(+Enum::_values[index], index + 1) :
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maximum(accumulator, index + 1);
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}
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ENUM(Channel, int, Red, Green, Blue)
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int main()
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{
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using ChannelSet = std::bitset<maximum<Channel>().to_integral() + 1>;
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ChannelSet red_only;
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red_only.set(Channel::Red);
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ChannelSet blue_only;
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blue_only.set(Channel::Blue);
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ChannelSet red_and_blue = red_only | blue_only;
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for (Channel channel : Channel::_values) {
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std::cout
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<< channel.to_string()
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<< " bit is set to "
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<< red_and_blue[channel.to_integral()]
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<< std::endl;
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}
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if (red_and_blue[Channel::Green])
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std::cout << "bit set contains Green" << std::endl;
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return 0;
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}
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