26 lines
588 B
C++
26 lines
588 B
C++
#pragma once
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namespace internal {
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template<typename T>
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class g_type_version {
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typedef char yes[1];
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typedef char no [2];
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template<typename C> static yes& test_version(decltype(&C::version));
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template<typename C> static no& test_version(...);
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static bool const has_version = sizeof(test_version<T>(nullptr)) == sizeof(yes);
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static constexpr const char* get_version(void) {
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if constexpr (has_version) {
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return T::version;
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} else {
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return "UNK"; // default version
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}
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}
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public:
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static constexpr const char* version = get_version();
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};
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} // internal
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