Differences
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cns:labs:lab-10 [2021/01/11 16:55] mihai.dumitru2201 [C++ objects memory layout] |
cns:labs:lab-10 [2021/01/11 16:59] (current) mihai.dumitru2201 [C++ objects memory layout] |
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| Line 310: | Line 310: | ||
| class B { | class B { | ||
| int a, b; | int a, b; | ||
| + | public: | ||
| virtual void f(void); | virtual void f(void); | ||
| }; | }; | ||
| Line 315: | Line 316: | ||
| class B1 { | class B1 { | ||
| int x, y; | int x, y; | ||
| + | public: | ||
| virtual void z(void); | virtual void z(void); | ||
| }; | }; | ||
| Line 320: | Line 322: | ||
| class D: public B, public B1 { | class D: public B, public B1 { | ||
| int c, d; | int c, d; | ||
| + | public: | ||
| void f(void); | void f(void); | ||
| void z(void); | void z(void); | ||
| }; | }; | ||
| - | D objD; B1 * ptrB1; | + | int main() |
| - | ptrB1 = &objD; | + | { |
| + | D objD; B1 * ptrB1; | ||
| + | ptrB1 = &objD; | ||
| + | ptrB1->z(); | ||
| + | } | ||
| </code> | </code> | ||
| Line 345: | Line 352: | ||
| We can also use the compiler to see the data layout. Copy the code above into | We can also use the compiler to see the data layout. Copy the code above into | ||
| - | a file ''dummy.cpp'' and add a main function to make it a valid program: | + | a file ''dummy.cpp''. |
| - | <code cpp> | + | |
| - | int main() { return sizeof(D); } | + | |
| - | </code> | + | |
| Then run: | Then run: | ||
