blob: 28e49bfc3c2d5eb3c9fa33ed6171e2a15fb5aae9 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
#pragma once
#include "range_ops.h"
#include <util/generic/array_ref.h>
#include <util/system/defaults.h> /* For alloca. */
namespace NStackArray {
/**
* A stack-allocated array. Should be used instead of � variable length
* arrays that are not part of C++ standard.
*
* Example usage:
* @code
* void f(int size) {
* // T array[size]; // Wrong!
* TStackArray<T> array(ALLOC_ON_STACK(T, size)); // Right!
* // ...
* }
* @endcode
*
* Note that it is generally a *VERY BAD* idea to use this in inline methods
* as those might be called from a loop, and then stack overflow is in the cards.
*/
template <class T>
class TStackArray: public TArrayRef<T> {
public:
inline TStackArray(void* data, size_t len)
: TArrayRef<T>((T*)data, len)
{
NRangeOps::InitializeRange(this->begin(), this->end());
}
inline ~TStackArray() {
NRangeOps::DestroyRange(this->begin(), this->end());
}
};
}
#define ALLOC_ON_STACK(type, n) alloca(sizeof(type) * (n)), (n)
|
