本文整理汇总了C++中allocator::allocate方法的典型用法代码示例。如果您正苦于以下问题：C++ allocator::allocate方法的具体用法？C++ allocator::allocate怎么用？C++ allocator::allocate使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类allocator的用法示例。
在下文中一共展示了allocator::allocate方法的13个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: push_front
void BigNumber::push_front(int num,const unsigned char c)
{//Push multiple characters front
if(!len){
cap=len=num+1;
val=alloc.allocate(cap);
first_free=val;
dot=0;
while(num--) alloc.construct(first_free++,c);
alloc.construct(first_free++,'+');
}else{
int newcap=len+num;
int newdot=dot;
unsigned char *newval=alloc.allocate(newcap);
unsigned char *newfirst_free=newval;
unsigned char *oldval=val;
while(num--) alloc.construct(newfirst_free++,c);
while(oldval!=first_free)
alloc.construct(newfirst_free++,*oldval++);
release();
val=newval;
first_free=newfirst_free;
cap=len=newcap;
dot=newdot;
}
}示例2: while
BigNumber& BigNumber::reverse_copy(BigNumber &A)
{//Reverse copy
cap=len=A.len;
val=alloc.allocate(cap);
first_free=val;
dot=0;
unsigned char *begin=A.first_free;
while(begin!=A.val){
alloc.construct(first_free++,*--begin);
if(*begin=='.') dot=first_free-val-1;
}
}示例3: free
String &String::operator=(const String &str)
{
char *p = alloc.allocate(str.sz);
char *q = p;
for(size_t i = 0;i < str.sz; ++i)
alloc.construct(q++,str.s[i]);
free();
s = p;
sz = str.sz;
return *this;
}示例4: reallocate
void StrVec::reallocate() {
auto newcapacity = size() ? 2 * size() : 1;
auto newdata = alloc.allocate(newcapacity);
auto dest = newdata;
auto elem = elements;
0
for (size_t i = 0; i != size(); ++i) {
alloc.construct(dest++, std::move(*elem++));
}
free();
elements = newdata;
first_free = dest;
cap = elements + newcapacity;
}示例5: push_back
void BigNumber::push_back(const unsigned char c)
{//Push a character back
if(!len||len>=cap){
int newcap=cap?(2*cap):2;
int newdot=dot;
unsigned char *newval=alloc.allocate(newcap);
unsigned char *newfirst_free=newval;
unsigned char *oldval=val;
while(oldval!=first_free) alloc.construct(newfirst_free++,*oldval++);
alloc.construct(newfirst_free++,c);
release();
val=newval;
first_free=newfirst_free;
len=first_free-val;
cap=newcap;
dot=newdot;
}else{alloc.construct(first_free++,c);len++;}
}示例6: release
BigNumber& BigNumber::dot_erase_copy(BigNumber &A)
{//Copy BigNumber without dot before division
release();
cap = A.dot ? (A.len - 1) : A.len;
len = cap;
dot = 0;
val=alloc.allocate(cap);
first_free = val;
int count = 0;
while(count < A.len){
alloc.construct(first_free++,A.val[count]);
if(A.val[++count]=='.')
if(++count == (A.len - 2) && A.val[count] == '0'){
++count;
--len;
}
}
return *this;
}示例7: cut_tail
void BigNumber::cut_tail(int num)
{
int newcap = num + 3;
int newdot;
unsigned char *newval = alloc.allocate(newcap);
unsigned char *newfirst_free = newval;
unsigned char *oldval = val;
while((first_free - oldval) != newcap) ++oldval;
unsigned char *start = oldval;
while(oldval != first_free){
if(*oldval == '.') newdot = oldval - start;
alloc.construct(newfirst_free++,*oldval++);
}
release();
val=newval;
first_free=newfirst_free;
len=first_free-val;
cap=newcap;
dot=newdot;
}示例8: get_double_float_array
core::result details::get_double_float_array(
const char * * buffers, const std::size_t * sizes,
std::size_t num_of_buffers,
std::size_t & current_buffer, const char * & buffer_position,
double * & values, std::size_t & length,
allocator & alloc)
{
int raw_length;
core::result res = get_integer(buffers, sizes, num_of_buffers,
current_buffer, buffer_position, raw_length);
if (res == core::ok)
{
length = static_cast<std::size_t>(raw_length);
double * new_array = static_cast<double *>(
alloc.allocate(length * sizeof(double)));
if (new_array != NULL)
{
values = new_array;
for (std::size_t i = 0; res == core::ok && i != length; ++i)
{
res = get_double_float(buffers, sizes, num_of_buffers,
current_buffer, buffer_position, values[i]);
}
if (res != core::ok)
{
alloc.deallocate(new_array);
}
}
else
{
res = core::no_memory;
}
}
return res;
}示例9: get_string
core::result details::get_string(const char * * buffers,
const std::size_t * sizes,
std::size_t num_of_buffers,
std::size_t & current_buffer, const char * & buffer_position,
const char * & value, std::size_t & length,
allocator & alloc)
{
int raw_length;
core::result res = get_integer(buffers, sizes, num_of_buffers,
current_buffer, buffer_position, raw_length);
if (res == core::ok)
{
length = static_cast<std::size_t>(raw_length);
char * new_buffer =
static_cast<char *>(alloc.allocate(length));
if (new_buffer != NULL)
{
value = new_buffer;
res = get_raw_string(buffers, sizes, num_of_buffers,
current_buffer, buffer_position,
new_buffer, length);
if (res != core::ok)
{
alloc.deallocate(new_buffer);
}
}
else
{
res = core::no_memory;
}
}
return res;
}示例10: get_boolean_array
core::result details::get_boolean_array(
const char * * buffers, const std::size_t * sizes,
std::size_t num_of_buffers,
std::size_t & current_buffer, const char * & buffer_position,
bool * & values, std::size_t & length,
allocator & alloc)
{
int raw_length;
core::result res = get_integer(buffers, sizes, num_of_buffers,
current_buffer, buffer_position, raw_length);
if (res == core::ok)
{
length = static_cast<std::size_t>(raw_length);
const std::size_t byte_length = length * sizeof(bool);
bool * new_array = static_cast<bool *>(
alloc.allocate(byte_length));
if (new_array != NULL)
{
std::memset(new_array, 0, byte_length);
values = new_array;
const std::size_t full_words = length / bits_in_word;
char word[bytes_in_word];
// first process full words
for (std::size_t i = 0; i != full_words; ++i)
{
res = get_word_preserve_order(
buffers, sizes, num_of_buffers,
current_buffer, buffer_position, word);
if (res != core::ok)
{
break;
}
for (std::size_t j = 0; j != bits_in_word; ++j)
{
const std::size_t byte_position = j / bits_in_byte;
const std::size_t bit_position = j % bits_in_byte;
if (word[byte_position] & (1 << bit_position))
{
values[i * bits_in_word + j] = true;
}
}
}
// tail (what could not be read as a full word)
if (res == core::ok)
{
res = get_word_preserve_order(
buffers, sizes, num_of_buffers,
current_buffer, buffer_position, word);
if (res == core::ok)
{
const std::size_t already_read_bits =
full_words * bits_in_word;
for (std::size_t j = already_read_bits;
j != length; ++j)
{
const std::size_t byte_position =
(j - already_read_bits) / bits_in_byte;
const std::size_t bit_position = j % bits_in_byte;
if (word[byte_position] & (1 << bit_position))
{
values[j] = true;
}
}
}
}
if (res != core::ok)
{
alloc.deallocate(new_array);
}
}
else
{
res = core::no_memory;
}
}
return res;
}示例11:
pair<string*, string*> StrVec::alloc_n_copy(const string *b, const string *e) {
auto data = alloc.allocate(e - b);
return { data, uninitialized_copy(b, e, data) };
}示例12: create
static T* create() {
T* p = alloc_.allocate(1);
if (!p) return nullptr;
alloc_.construct(p);
return p;
};示例13:
pair<char*, char*> String::alloc_n_copy(const char* b, const char* e)
{
auto str = alloc.allocate(e - b);
return {str, uninitialized_copy(b, e, str)};
}