0_0_23275362_23673.cpp: In function 'int main()':
0_0_23275362_23673.cpp:37:42: error: invalid conversion from 'int (*)(const trade_t*, const trade_t*) {aka int (*)(const trade_s*, const trade_s*)}' to 'int (*)(const void*, const void*)' [-fpermissive]
qsort(w, n, sizeof(trade_t), comp);
^
In file included from 0_0_23275362_23673.cpp:2:0:
GCC4.9.2/x86_64-w64-mingw32/include/stdlib.h:353:16: note: initializing argument 4 of 'void qsort(void*, size_t, size_t, int (*)(const void*, const void*))'
void __cdecl qsort(void *_Base,size_t _NumOfElements,size_t _SizeOfElements,int (__cdecl *_PtFuncCompare)(const void *,const void *));
^
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