Use-Nullptr Transform¶
The Use-Nullptr Transform is a transformation to convert the usage of null pointer constants (eg. NULL, 0) to use the new C++11 nullptr keyword. The transform is enabled with the -use-nullptr option of clang-modernize.
Example¶
void assignment() {
char *a = NULL;
char *b = 0;
char c = 0;
}
int *ret_ptr() {
return 0;
}
transforms to:
void assignment() {
char *a = nullptr;
char *b = nullptr;
char c = 0;
}
int *ret_ptr() {
return nullptr;
}
User defined macros¶
By default this transform will only replace the NULL macro and will skip any user-defined macros that behaves like NULL. The user can use the -user-null-macros option to specify a comma-separated list of macro names that will be transformed along with NULL.
Example¶
#define MY_NULL (void*)0
void assignment() {
void *p = MY_NULL;
}
using the command-line
clang-modernize -use-nullptr -user-null-macros=MY_NULL foo.cpp
transforms to:
#define MY_NULL NULL
void assignment() {
int *p = nullptr;
}