// MANIPULATORS
bsl::shared_ptr<char>
SharedPtrUtil::createInplaceUninitializedBuffer(
size_t bufferSize,
bslma::Allocator *basicAllocator)
{
basicAllocator = bslma::Default::allocator(basicAllocator);
// allocator is optional
// We have alignment concerns here: there are no alignment issues with
// 'bslstl::SharedPtrRep', but the buffer address (i.e., the address of
// 'd_instance' in the 'bslstl::SharedPtrInplaceRep' object) must be at
// least *naturally* *aligned* to 'bufferSize'. See the 'bslma' package-
// level documentation for a definition of natural alignment.) We achieve
// this in the simplest way by always maximally aligning the returned
// pointer.
typedef bslma::SharedPtrInplaceRep<bsls::AlignmentUtil::MaxAlignedType>
Rep;
enum {
k_ALIGNMENT_MASK = ~(bsls::AlignmentUtil::BSLS_MAX_ALIGNMENT - 1)
};
size_t repSize = (sizeof(Rep) + bufferSize - 1) & k_ALIGNMENT_MASK;
Rep *rep = new (basicAllocator->allocate(repSize)) Rep(basicAllocator);
return bsl::shared_ptr<char>(reinterpret_cast<char *>(rep->ptr()), rep);
}
void wstring::alloc(size_t size, bool save) {
if (! check_realloc(size))
return;
Rep *p = Rep::create(size);
if (save) {
p->copy(0, data(), length());
p->len = length();
}
else
p->len = 0;
repup(p);
}
wstring& wstring::replace(size_t pos, size_t n1, const wchar_t* s, size_t n2) {
const size_t len = length();
if (pos > len)
throw out_of_range("pos > len");
if (n1 > len - pos)
n1 = len - pos;
if (len - n1 > max_size() - n2)
throw length_error("len - n1 > max_size() - n2");
size_t newlen = len - n1 + n2;
if (check_realloc(newlen)) {
Rep *p = Rep::create(newlen);
p->copy(0, data(), pos);
p->copy(pos + n2, data() + pos + n1, len -(pos + n1));
p->copy(pos, s, n2);
repup(p);
}
else {
rep()->move(pos + n2, data() + pos + n1, len -(pos + n1));
rep()->copy(pos, s, n2);
}
rep()->len = newlen;
return *this;
}
wchar_t* wstring::Rep::clone() {
Rep* p = Rep::create(len);
p->copy(0, data(), len);
p->len = len;
return p->data();
}
void test_matrix_rep()
{
Rep matrix;
matrix.set(1, 1, 1);
matrix.reserve(3, 3);
matrix.set(3, 2, 3);
assert(matrix.get(3, 2) == 3);
assert(matrix.get(4, 3) == 0);
assert(matrix.is_null(4,3));
assert(!matrix.is_null(3,2));
matrix.set(4, 2, 2);
matrix.reserve(4, 4);
assert(matrix.get(3, 2) == 3);
assert(matrix.get(4, 2) == 2);
assert(!matrix.is_null(4, 2));
assert(matrix.is_null(10, 10));
}