I have a global array in my program and I want to be able to change it's size at least once in the beginning using a function. Basically like this:
pthread_t threadsArray[10]; //default size: 10
void SetMaxThreads(unsigned int count) {
pthread_t threadsArray[count];
}
What would you suggest me to do? How could I accomplish this?
I would suggest to use standard container std::vector instead of the array.
For example
std::vector<pthread_t> threadsArray( 10 ); //default size: 10
void SetMaxThreads(unsigned int count) {
threadsArray.resize( count );
}
You could declare a dynamic array. This can be done with two different ways. You can either use std::vector, or you can use pointers.Vector Documentation. Example using pointers:
pthread_t *threadsArray; // no default size
void SetMaxThreads(unsigned int count) {
delete [] threadsArray;
threadsArray = new pthread_t[count];
}
Edit: as some comments pointed out, it is safer to use std::unique_ptr<pthread_t[]> instead of array pointers.std::unique_ptr Documentation
std::unique_ptr<pthread_t[]> would be better than raw owning pointer.
new throws, threadsArray will not point to valid memory). There is a reason why the use of raw pointers is discouraged...