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highlight nullptr

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This commit is contained in:
Jidong Xiao
2023-09-12 13:32:26 -04:00
parent fd4ed700da
commit b1e80debdc
1 changed files with 2 additions and 2 deletions
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lectures/04_pointers/README.md
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@@ -117,7 +117,7 @@ the previous user of that memory.
– But NULL is not a valid memory location you are allowed to read or write. If you try to dereference or – But NULL is not a valid memory location you are allowed to read or write. If you try to dereference or
follow a NULL pointer, your program will immediately crash. You may see a segmentation fault, a bus follow a NULL pointer, your program will immediately crash. You may see a segmentation fault, a bus
error, or something about a null pointer dereference. error, or something about a null pointer dereference.
– NOTE: In C++11, we are encouraged to switch to use nullptr instead of NULL or 0, to avoid some – NOTE: In C++11, we are encouraged to switch to use **nullptr** instead of NULL or 0, to avoid some
subtle situations where NULL is incorrectly seen as an int type instead of a pointer. For this course we subtle situations where NULL is incorrectly seen as an int type instead of a pointer. For this course we
will assume NULL and nullptr are equivalent. will assume NULL and nullptr are equivalent.
– We indicate a NULL or nullptr value in diagrams with a slash through the memory location box. – We indicate a NULL or nullptr value in diagrams with a slash through the memory location box.
@@ -129,7 +129,7 @@ cout << *p << endl.
``` ```
tests to see if p is pointing somewhere that appears to be useful before accessing and printing the value stored tests to see if p is pointing somewhere that appears to be useful before accessing and printing the value stored
at that location. at that location.
- But don’t make the mistake of assuming pointers are automatically initialized to NULL - But don’t make the mistake of assuming pointers are automatically initialized to NULL.
## 4.7 Arrays ## 4.7 Arrays