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Full Discussion: Mismatch free() / delete / delete [C++]
Operating Systems Linux Mismatch free() / delete / delete [C++] Post 302984981 by SA_Palani on Thursday 3rd of November 2016 10:53:37 AM
Old 11-03-2016
Code Mismatch free() / delete / delete [C++]
Dear All,

I got the valgrind report as below [c++]

Code:
Mismatch free() / delete / delete []
at 0x4006895: operator delete(void*) (vg_replace_malloc.c:480)
by 0x8EA6D11: corefunction.

I supect that it is expect me to write free() instead of delete p1.
Given the the code.


I have the structure.

Code:
struct Pack
{
    unsigned int A;
    unsigned int B;
    unsigned int c;
    unsigned int D;    
}
 
 
int corefunction()
{
 
 
    Pack *p1=new Pack;
    I filled the value for the p1 object.
    I called a virtual funcion by passing the p1 like this
    Send((void*)p1); //
 
 
    if(p1)
        delete p1;    // Here is the place where i have the doubt that wheher is it expecting to deallocate with free().
 
 
    return 0;
}    
 
bool Send(void* &get_SendData) 
{  
    sendNextLevel(get_SendData  )
}
     
char* sendNextLevel(void* data)
{
                dataLen = sizeof(PackedSysTime);
 
 
                    Pack* txData = NULL;
                    txData = (Pack*)data;
}

since we have converted void pointer to struct without new operator like c-style casting, does it expecting us to write free while we deallocate the memory

Thank you.
Last edited by Corona688; 11-03-2016 at 12:05 PM..
 

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LEARN ABOUT DEBIAN

std::__atomic_base

std::__atomic_base< _ITp >(3cxx)										  std::__atomic_base< _ITp >(3cxx)

NAME

       std::__atomic_base< _ITp > -

SYNOPSIS

       Inherited by std::atomic< char >, std::atomic< char16_t >, std::atomic< char32_t >, std::atomic< int >, std::atomic< long >, std::atomic<
       long long >, std::atomic< short >, std::atomic< signed char >, std::atomic< unsigned char >, std::atomic< unsigned int >, std::atomic<
       unsigned long >, std::atomic< unsigned long long >, std::atomic< unsigned short >, and std::atomic< wchar_t >.

   Public Member Functions
       __atomic_base (const __atomic_base &)=delete
       constexpr __atomic_base (__int_type __i) noexcept
       bool compare_exchange_strong (__int_type &__i1, __int_type __i2, memory_order __m1, memory_order __m2) noexcept
       bool compare_exchange_strong (__int_type &__i1, __int_type __i2, memory_order __m1, memory_order __m2) volatilenoexcept
       bool compare_exchange_strong (__int_type &__i1, __int_type __i2, memory_order __m=memory_order_seq_cst) noexcept
       bool compare_exchange_strong (__int_type &__i1, __int_type __i2, memory_order __m=memory_order_seq_cst) volatilenoexcept
       bool compare_exchange_weak (__int_type &__i1, __int_type __i2, memory_order __m1, memory_order __m2) noexcept
       bool compare_exchange_weak (__int_type &__i1, __int_type __i2, memory_order __m1, memory_order __m2) volatilenoexcept
       bool compare_exchange_weak (__int_type &__i1, __int_type __i2, memory_order __m=memory_order_seq_cst) noexcept
       bool compare_exchange_weak (__int_type &__i1, __int_type __i2, memory_order __m=memory_order_seq_cst) volatilenoexcept
       __int_type exchange (__int_type __i, memory_order __m=memory_order_seq_cst) noexcept
       __int_type exchange (__int_type __i, memory_order __m=memory_order_seq_cst) volatilenoexcept
       __int_type fetch_add (__int_type __i, memory_order __m=memory_order_seq_cst) noexcept
       __int_type fetch_add (__int_type __i, memory_order __m=memory_order_seq_cst) volatilenoexcept
       __int_type fetch_and (__int_type __i, memory_order __m=memory_order_seq_cst) noexcept
       __int_type fetch_and (__int_type __i, memory_order __m=memory_order_seq_cst) volatilenoexcept
       __int_type fetch_or (__int_type __i, memory_order __m=memory_order_seq_cst) noexcept
       __int_type fetch_or (__int_type __i, memory_order __m=memory_order_seq_cst) volatilenoexcept
       __int_type fetch_sub (__int_type __i, memory_order __m=memory_order_seq_cst) noexcept
       __int_type fetch_sub (__int_type __i, memory_order __m=memory_order_seq_cst) volatilenoexcept
       __int_type fetch_xor (__int_type __i, memory_order __m=memory_order_seq_cst) noexcept
       __int_type fetch_xor (__int_type __i, memory_order __m=memory_order_seq_cst) volatilenoexcept
       bool is_lock_free () const noexcept
       bool is_lock_free () const volatilenoexcept
       __int_type load (memory_order __m=memory_order_seq_cst) const noexcept
       __int_type load (memory_order __m=memory_order_seq_cst) const volatilenoexcept
       operator __int_type () const noexcept
       operator __int_type () const volatilenoexcept
       __int_type operator&= (__int_type __i) noexcept
       __int_type operator&= (__int_type __i) volatilenoexcept
       __int_type operator++ (int) noexcept
       __int_type operator++ (int) volatilenoexcept
       __int_type operator++ () noexcept
       __int_type operator++ () volatilenoexcept
       __int_type operator+= (__int_type __i) noexcept
       __int_type operator+= (__int_type __i) volatilenoexcept
       __int_type operator-- (int) noexcept
       __int_type operator-- (int) volatilenoexcept
       __int_type operator-- () noexcept
       __int_type operator-- () volatilenoexcept
       __int_type operator-= (__int_type __i) noexcept
       __int_type operator-= (__int_type __i) volatilenoexcept
       __atomic_base & operator= (const __atomic_base &)=delete
       __atomic_base & operator= (const __atomic_base &) volatile=delete
       __int_type operator= (__int_type __i) noexcept
       __int_type operator= (__int_type __i) volatilenoexcept
       __int_type operator^= (__int_type __i) noexcept
       __int_type operator^= (__int_type __i) volatilenoexcept
       __int_type operator|= (__int_type __i) noexcept
       __int_type operator|= (__int_type __i) volatilenoexcept
       void store (__int_type __i, memory_order __m=memory_order_seq_cst) noexcept
       void store (__int_type __i, memory_order __m=memory_order_seq_cst) volatilenoexcept

Detailed Description
   template<typename _ITp>struct std::__atomic_base< _ITp >
       Base class for atomic integrals.

       Definition at line 314 of file atomic_base.h.

Author
       Generated automatically by Doxygen for libstdc++ from the source code.

libstdc++							  Sun Jan 6 2013				  std::__atomic_base< _ITp >(3cxx)
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