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Does someone know the way to define constant-sized vector?
For example, instead of defining
std::vector<int> it will be
std::vector<10, int> It should be completely cross-platformed. Maybe an open source class?
680
The C++ function std::vector::resize() changes the size of vector. If n is smaller than current size then extra elements are destroyed. If n is greater than current container size then new elements are inserted at the end of vector.
max_size() is the theoretical maximum number of items that could be put in your vector. On a 32-bit system, you could in theory allocate 4Gb == 2^32 which is 2^32 char values, 2^30 int values or 2^29 double values.
The capacity of the vector is completely implementation-dependent, no one can tell how it's growing..
size() – Returns the number of elements in the vector. max_size() – Returns the maximum number of elements that the vector can hold. capacity() – Returns the size of the storage space currently allocated to the vector expressed as number of elements.
The std::vector can always grow dynamically, but there are two ways you can allocate an initial size:
This allocates initial size and fills the elements with zeroes:
std::vector<int> v(10); v.size(); //returns 10 This allocates an initial size but does not populate the array with zeroes:
std::vector<int> v; v.reserve(10); v.size(); //returns 0 If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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