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dsd/Dsd2Pcm: convert struct GenerateCtableValue to lambda 

Since we have dropped support for GCC 6 a while ago, we can use
constexpr lambdas now.
This commit is contained in:
Max Kellermann 2020-05-07 13:30:20 +02:00
parent a24ef280cc
commit eeec0ee804
1 changed files with 5 additions and 12 deletions
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17
src/pcm/Dsd2Pcm.cxx
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@ -130,24 +130,17 @@ CalculateCtableValue(size_t t, int k, int e) noexcept
return float(acc); return float(acc);
} }
/* this needs to be a struct because GCC 6 doesn't have constexpr
lambdas (C++17) */
struct GenerateCtableValue {
size_t t;
int k;
constexpr auto operator()(int e) const noexcept {
return CalculateCtableValue(t, k, e);
}
};
static constexpr auto static constexpr auto
GenerateCtable(int t) noexcept GenerateCtable(int t) noexcept
{ {
int k = HTAPS - t*8; int k = HTAPS - t*8;
if (k>8) k=8; if (k>8) k=8;
return GenerateArray<256>(GenerateCtableValue{CTABLES - 1 - t, k}); const size_t t_ = CTABLES - 1 - t;
return GenerateArray<256>([t_, k](int e){
return CalculateCtableValue(t_, k, e);
});
} }
static constexpr auto ctables = GenerateArray<CTABLES>(GenerateCtable); static constexpr auto ctables = GenerateArray<CTABLES>(GenerateCtable);