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modified post 05a47e7c by Anonymous on Mon 13th Jun 2022 15:58
original post 85c7c607e by Anonymous on Mon 13th Jun 2022 15:57
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$ clang++ -std=gnu++11 -g std_string_custom_new1.cpp

	1	+	$ clang++ -std=gnu++11 -g std_string_custom_new1.cpp
1	9
2		-	/*
	10	+
3		-	* Custom basic_string::operator new() - does not work yet
	11	+
4		-	*
	12	+
5		-	* $ g++ -std=gnu++11 -g std_string_custom_new1.cpp
	13	+
6		-	* std_string_custom_new1.cpp:12:7: error: ?template<class _CharT, class _Traits, class _Alloc> class std::__cxx11::basic_string? used without template arguments
	14	+
7		-	* 12 \| void *basic_string::operator new(size_t size)
	15	+
8		-	* \| ^~~~~~~~~~~~
	16	+
9		-	*/
	17	+
10	18
11		-	#include <iostream>
	19	+
12		-	#include <stdlib.h>
	20	+
13		-	#include <stdio.h>
	21	+
14		-	#include <unistd.h>
	22	+
15	23
16		-	using namespace std;
	24	+
17	25
18		-	char mymemoryarena[65536];
	26	+
19		-	size_t mymemoryarena_index = 0;
	27	+
20	28
21		-	void *basic_string::operator new(size_t size)
	29	+
22		-	{
	30	+
23		-	write(1, "#mark", 5);
	31	+
24		-	void *ptr = &mymemoryarena[mymemoryarena_index];
	32	+
25	33
26		-	mymemoryarena_index += size;
	34	+
27	35
28		-	return ptr;
	36	+
29		-	}
	37	+
30	38
31		-	int main(int ac, char *av[])
	39	+
32		-	{
	40	+
33		-	(void)puts("#start.");
	41	+
34	42
35		-	string *x1 = new string("hello");
	43	+
36		-	string *x2 = new string("world");
	44	+
37	45
38		-	string x3 = x1 + string(" ") + x2;
	46	+
39	47
40		-	cout << x3 << endl;
	48	+
41	49
42	50
43		-	(void)puts("#done.");
	51	+
44		-	return EXIT_SUCCESS;
	52	+
45		-	}
	53	+
46	54