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C++ convert hex string to signed integer
...> std::hex >> out.value;
return in;
}
};
Used like
uint32_t value = boost::lexical_cast<HexTo<uint32_t> >("0x2a");
That way you don't need one impl per int type.
share
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...
How do I detect unsigned integer multiply overflow?
...the largest operand's highest one-bit. For example:
bool addition_is_safe(uint32_t a, uint32_t b) {
size_t a_bits=highestOneBitPosition(a), b_bits=highestOneBitPosition(b);
return (a_bits<32 && b_bits<32);
}
For multiplication, any two operands will result in (at most) the s...
Quickly find whether a value is present in a C array?
... the last entry in the array, then return true
Return false
bool check(uint32_t theArray[], uint32_t compareVal)
{
uint32_t i;
uint32_t x = theArray[SIZE-1];
if (x == compareVal)
return true;
theArray[SIZE-1] = compareVal;
for (i = 0; theArray[i] != compareVal; i++);
...
Why can't C compilers rearrange struct members to eliminate alignment padding? [duplicate]
... data directly):
struct __attribute__((__packed__)) LocalFileHeader {
uint32_t signature;
uint16_t minVersion, flag, method, modTime, modDate;
uint32_t crc32, compressedSize, uncompressedSize;
uint16_t nameLength, extraLength;
};
The packed attribute prevents the compiler from ali...
How to create NS_OPTIONS-style bitmask enumerations in Swift?
...like this:
struct MyOptions : RawOptionSetType {
typealias RawValue = UInt
private var value: UInt = 0
init(_ value: UInt) { self.value = value }
init(rawValue value: UInt) { self.value = value }
init(nilLiteral: ()) { self.value = 0 }
static var allZeros: MyOptions { return...
Kill child process when parent process is killed
... public Int64 PerJobUserTimeLimit;
public Int16 LimitFlags;
public UInt32 MinimumWorkingSetSize;
public UInt32 MaximumWorkingSetSize;
public Int16 ActiveProcessLimit;
public Int64 Affinity;
public Int16 PriorityClass;
public Int16 SchedulingClass;
}
[StructLayout(LayoutK...
Random number generation in C++11: how to generate, how does it work? [closed]
...t19937 MyRNG; // the Mersenne Twister with a popular choice of parameters
uint32_t seed_val; // populate somehow
MyRNG rng; // e.g. keep one global instance (per thread)
void initialize()
{
rng.seed(seed_val);
}
Now we can create distributions:
std::uniform_int_di...
Real world use cases of bitwise operators [closed]
...egister to make some piece of hardware do what you want it to:
volatile uint32_t *register = (volatile uint32_t *)0x87000000;
uint32_t value;
uint32_t set_bit = 0x00010000;
uint32_t clear_bit = 0x00001000;
value = *register; // get current value from the r...
How to write a large buffer into a binary file in C++, fast?
...thm>
#include <iostream>
#include <cassert>
std::vector<uint64_t> GenerateData(std::size_t bytes)
{
assert(bytes % sizeof(uint64_t) == 0);
std::vector<uint64_t> data(bytes / sizeof(uint64_t));
std::iota(data.begin(), data.end(), 0);
std::shuffle(data.begin...
hash function for string
...enkins One At A Time Hash. It also quotes improved versions of this hash.
uint32_t jenkins_one_at_a_time_hash(char *key, size_t len)
{
uint32_t hash, i;
for(hash = i = 0; i < len; ++i)
{
hash += key[i];
hash += (hash << 10);
hash ^= (hash >> 6);
...