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u128: Add u128::Bit

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This commit is contained in:
MerryMage 2018-07-23 15:57:05 +01:00
parent 3e62fea003
commit 5566fab29a
1 changed files with 11 additions and 1 deletions
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12
src/common/u128.h
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@ -24,7 +24,7 @@ struct u128 {
u128(u64 lower_, u64 upper_) : lower(lower_), upper(upper_) {} u128(u64 lower_, u64 upper_) : lower(lower_), upper(upper_) {}
template <typename T> template<typename T>
/* implicit */ u128(T value) : lower(value), upper(0) { /* implicit */ u128(T value) : lower(value), upper(0) {
static_assert(std::is_integral_v<T>); static_assert(std::is_integral_v<T>);
static_assert(Common::BitSize<T>() <= Common::BitSize<u64>()); static_assert(Common::BitSize<T>() <= Common::BitSize<u64>());
@ -32,6 +32,16 @@ struct u128 {
u64 lower = 0; u64 lower = 0;
u64 upper = 0; u64 upper = 0;
template<size_t bit_position>
bool Bit() {
static_assert(bit_position < 128);
if constexpr (bit_position < 64) {
return Common::Bit<bit_position>(lower);
} else {
return Common::Bit<bit_position - 64>(upper);
}
}
}; };
static_assert(Common::BitSize<u128>() == 128); static_assert(Common::BitSize<u128>() == 128);