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Add StrongTypedef to bn::base #8288

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Add StrongTypedef to bn::base #8288

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13 changes: 13 additions & 0 deletions base/compiler.h
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Original file line number Diff line number Diff line change
Expand Up @@ -71,3 +71,16 @@

#define BN_IGNORE_DEPRECATION_WARNINGS_BEGIN BN_IGNORE_WARNINGS_BEGIN("-Wdeprecated-declarations", 4996)
#define BN_IGNORE_DEPRECATION_WARNINGS_END BN_IGNORE_WARNINGS_END

// BN_EMPTY_BASES
//
// Applied to a class definition to enable the empty base optimization across multiple
// empty base classes. Clang and GCC do this unconditionally, but MSVC only collapses a
// single empty base unless the class is annotated with __declspec(empty_bases). Without
// it, a class with several empty bases is padded larger than the sum of its data members.

#if defined(_MSC_VER)
#define BN_EMPTY_BASES __declspec(empty_bases)
#else
#define BN_EMPTY_BASES
#endif
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