代码内存泄露检测工具(linux gcc + valrind)

https://www.cnblogs.com/wangkangluo1/archive/2011/07/20/2111248.html

linux命令如下：valgrind --tool=memcheck --leak-check=full ./a.out

如下：

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linux命令如下：valgrind --tool=memcheck --leak-check=full ./a.out

举例说明：

#include <iostream>
using namespace std;

int main(int argc, char *argv[])
{
    string* s = new string("hello world");
    cout<<*s<<endl;
    
    int* m = new int(100);
    cout<<*m<<endl;
    
    delete m;
    
    return 0;
}

//running:
nol@nol-VirtualBox:~/desktop$ valgrind --tool=memcheck --leak-check=full ./a.out
==5233== Memcheck, a memory error detector
==5233== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==5233== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==5233== Command: ./a.out
==5233== 
hello world
100
==5233== 
==5233== HEAP SUMMARY:
==5233==     in use at exit: 72,736 bytes in 2 blocks
==5233==   total heap usage: 4 allocs, 2 frees, 73,764 bytes allocated
==5233== 
==5233== 32 bytes in 1 blocks are definitely lost in loss record 1 of 2
==5233==    at 0x4C2E0EF: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==5233==    by 0x400C40: main (in /home/nol/desktop/a.out)
==5233== 
==5233== LEAK SUMMARY:
==5233==    definitely lost: 32 bytes in 1 blocks
==5233==    indirectly lost: 0 bytes in 0 blocks
==5233==      possibly lost: 0 bytes in 0 blocks
==5233==    still reachable: 72,704 bytes in 1 blocks
==5233==         suppressed: 0 bytes in 0 blocks
==5233== Reachable blocks (those to which a pointer was found) are not shown.
==5233== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==5233== 
==5233== For counts of detected and suppressed errors, rerun with: -v
==5233== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
nol@nol-VirtualBox:~/desktop$ 

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#include <iostream>

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using namespace std;

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int main(int argc, char *argv[])

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{

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    string* s = new string("hello world");

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    cout<<*s<<endl;

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    int* m = new int(100);

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    cout<<*m<<endl;

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    delete m;

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    return 0;

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}

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//running:

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nol@nol-VirtualBox:~/desktop$ valgrind --tool=memcheck --leak-check=full ./a.out

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==5233== Memcheck, a memory error detector

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==5233== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.

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==5233== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info

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==5233== Command: ./a.out

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==5233== 

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hello world

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100

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==5233== 

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==5233== HEAP SUMMARY:

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==5233==     in use at exit: 72,736 bytes in 2 blocks

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==5233==   total heap usage: 4 allocs, 2 frees, 73,764 bytes allocated

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==5233== 

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==5233== 32 bytes in 1 blocks are definitely lost in loss record 1 of 2

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==5233==    at 0x4C2E0EF: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)

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==5233==    by 0x400C40: main (in /home/nol/desktop/a.out)

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==5233== 

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==5233== LEAK SUMMARY:

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==5233==    definitely lost: 32 bytes in 1 blocks

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==5233==    indirectly lost: 0 bytes in 0 blocks

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==5233==      possibly lost: 0 bytes in 0 blocks

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==5233==    still reachable: 72,704 bytes in 1 blocks

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==5233==         suppressed: 0 bytes in 0 blocks

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==5233== Reachable blocks (those to which a pointer was found) are not shown.

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==5233== To see them, rerun with: --leak-check=full --show-leak-kinds=all

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==5233== 

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==5233== For counts of detected and suppressed errors, rerun with: -v

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==5233== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)

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nol@nol-VirtualBox:~/desktop$ 

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