diff options
Diffstat (limited to 'src/decoder/integer_sequence_codec.cc')
| -rw-r--r-- | src/decoder/integer_sequence_codec.cc | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/src/decoder/integer_sequence_codec.cc b/src/decoder/integer_sequence_codec.cc index 83c0359..c2cd511 100644 --- a/src/decoder/integer_sequence_codec.cc +++ b/src/decoder/integer_sequence_codec.cc @@ -193,13 +193,20 @@ inline constexpr bool IsPow2(T x) { return (x & (x - 1)) == 0; } const int kInterleavedQuintBits[3] = { 3, 2, 2 }; const int kInterleavedTritBits[5] = { 2, 2, 1, 2, 1 }; +// Some template meta programming to get around the fact that MSVC +// will not allow (ValRange == 5) ? 3 : 5 as a template parameter +template<int ValRange> +struct DecodeBlockSize { + enum { value = (ValRange == 5 ? 3 : 5) }; +}; + // Decodes either a trit or quint block using the BISE (Bounded Integer Sequence // Encoding) defined in Section C.2.12 of the ASTC specification. ValRange is // expected to be either 3 or 5 depending on whether or not we're encoding trits // or quints respectively. In other words, it is the remaining factor in whether // the passed blocks contain encoded values of the form 3*2^k or 5*2^k. template<int ValRange> -std::array<int, /* kNumVals = */ (ValRange == 5) ? 3 : 5> DecodeISEBlock( +std::array<int, /* kNumVals = */ DecodeBlockSize<ValRange>::value> DecodeISEBlock( uint64_t block_bits, int num_bits) { static_assert(ValRange == 3 || ValRange == 5, "We only know about trits and quints"); |