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| size_t val = 0; | |
| // val expression is l-value | |
| val = 1; | |
| size_t fn() { // ... } | |
| // Result of fn call expr is an r-value | |
| fn(); | |
| //It cannot be an l-value | |
| fn() = val; // compilation error | |
| size_t& fn_ref() { // ... } | |
| //It is an l-value | |
| fn_ref() = val; // allowed |
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