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Enable empty base class optimization on MSVC #66

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Enable empty base class optimization on MSVC #66

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14 changes: 11 additions & 3 deletions include/pcg_random.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -94,10 +94,18 @@

#ifdef _MSC_VER
#define PCG_ALWAYS_INLINE __forceinline
#if defined(_MSC_FULL_VER) && _MSC_FULL_VER >= 190024210
// available since VS 2015 Update 2/3
#define PCG_EBO __declspec(empty_bases)
#else
#define PCG_EBO
#endif
#elif __GNUC__
#define PCG_ALWAYS_INLINE __attribute__((always_inline))
#define PCG_EBO
#else
#define PCG_ALWAYS_INLINE inline
#define PCG_EBO
#endif

/*
Expand Down Expand Up @@ -375,7 +383,7 @@ template <typename xtype, typename itype,
bool output_previous = true,
typename stream_mixin = oneseq_stream<itype>,
typename multiplier_mixin = default_multiplier<itype> >
class engine : protected output_mixin,
class PCG_EBO engine : protected output_mixin,
public stream_mixin,
protected multiplier_mixin {
protected:
Expand Down Expand Up @@ -1187,7 +1195,7 @@ struct xsl_mixin {


template <typename baseclass>
struct inside_out : private baseclass {
struct PCG_EBO inside_out : private baseclass {
inside_out() = delete;

typedef typename baseclass::result_type result_type;
Expand Down Expand Up @@ -1229,7 +1237,7 @@ struct inside_out : private baseclass {


template <bitcount_t table_pow2, bitcount_t advance_pow2, typename baseclass, typename extvalclass, bool kdd = true>
class extended : public baseclass {
class PCG_EBO extended : public baseclass {
public:
typedef typename baseclass::state_type state_type;
typedef typename baseclass::result_type result_type;
Expand Down