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Pointers, smart pointers or shared pointers? [duplicate]
...assume you meant scoped pointer which uses the RAII pattern. It is a stack-allocated object that wraps a pointer; when it goes out of scope, it calls delete on the pointer it wraps. It "owns" the contained pointer in that it is in charge of deleteing it at some point. They allow you to get a raw ref...
How can I use “sizeof” in a preprocessor macro?
...wer, but to add on to Mike's version, here's a version we use that doesn't allocate any memory. I didn't come up with the original size check, I found it on the internet years ago and unfortunately can't reference the author. The other two are just extensions of the same idea.
Because they are type...
Meaning of acronym SSO in the context of std::string
...es ("from the stack", which are variables that you create without calling malloc / new) are generally much faster than those involving the free store ("the heap", which are variables that are created using new). However, the size of automatic arrays is fixed at compile time, but the size of arrays f...
Initialize a byte array to a certain value, other than the default null? [duplicate]
...then discarding several (perhaps many) intermediate arrays instead of just allocating a single array and then filling it.
– LukeH
May 27 '11 at 9:25
3
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Which parts of Real World Haskell are now obsolete or considered bad practice?
...re_ptr -- release with free()
return (Right (Regex reg str))
As malloc() should be used with free(), new with delete, allocate with deallocate, one should always use the correct function.
TL;DR You should always free memory with the same allocator that allocated it for you.
If a fore...
Return a `struct` from a function in C
... function, to which I replied: "No! You'd return pointers to dynamically malloc ed struct s instead."
9 Answers
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Difference between a “coroutine” and a “thread”?
...d for a certain amount time (on a single processor machine). The scheduler allocates time (timeslicing) to each thread, and if the thread isn't finished within that time, the scheduler pre-empts it (interrupts it and switches to another thread). Multiple threads can run in parallel on a multi-proce...
Most efficient way to concatenate strings?
...e expected semantics of a 'string join' operation).
Next, given the total allocation size of the final string, the biggest boost in performance is gained by building the result string in-place. Doing this requires the (perhaps controversial) technique of temporarily suspending the immutability of a...
How do I convert Long to byte[] and back in java
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public byte[] longToBytes(long x) {
ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES);
buffer.putLong(x);
return buffer.array();
}
public long bytesToLong(byte[] bytes) {
ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES);
buffer.put(bytes);
buffer.flip();//need flip ...
Removing trailing newline character from fgets() input
... helpful answer. Can we use strlen(buffer) when buffer size is dynamically allocated using malloc ?
– rrz0
Nov 10 '18 at 10:16
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