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uint128: Make to_integer(), to_uint64() assert magnitude

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- All places these are used already handle magnitude checks correctly
- As a "bit-twiddling" method, low_bits() truncates
- As a "semantics preserving type conversion" method, to_uint64() asserts
- Add low_32_bits() as a "bit-twiddling" non-asserting to_integer() equivalent
This commit is contained in:
theoretical 2015-01-30 12:59:43 -05:00
parent 4b8c211629
commit 27e224b012
1 changed files with 15 additions and 2 deletions
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17
include/fc/uint128.hpp
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@ -3,6 +3,8 @@
#include <stdint.h> #include <stdint.h>
#include <string> #include <string>
#include <fc/exception/exception.hpp>
#ifdef _MSC_VER #ifdef _MSC_VER
#pragma warning (push) #pragma warning (push)
#pragma warning (disable : 4244) #pragma warning (disable : 4244)
@ -74,8 +76,19 @@ namespace fc
friend bool operator >= ( const uint128& l, const uint128& r ) { return l == r || l > r; } friend bool operator >= ( const uint128& l, const uint128& r ) { return l == r || l > r; }
friend bool operator <= ( const uint128& l, const uint128& r ) { return l == r || l < r; } friend bool operator <= ( const uint128& l, const uint128& r ) { return l == r || l < r; }
uint32_t to_integer()const { return (uint32_t)lo; } uint32_t to_integer()const
uint64_t to_uint64()const { return lo; } {
FC_ASSERT( hi == 0 );
uint32_t lo32 = (uint32_t) lo;
FC_ASSERT( lo == lo32 );
return lo32;
}
uint64_t to_uint64()const
{
FC_ASSERT( hi == 0 );
return lo;
}
uint32_t low_32_bits()const { return (uint32_t) lo; }
uint64_t low_bits()const { return lo; } uint64_t low_bits()const { return lo; }
uint64_t high_bits()const { return hi; } uint64_t high_bits()const { return hi; }