本文整理汇总了C++中std::basic_string::reserve方法的典型用法代码示例。如果您正苦于以下问题：C++ basic_string::reserve方法的具体用法？C++ basic_string::reserve怎么用？C++ basic_string::reserve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std::basic_string的用法示例。
在下文中一共展示了basic_string::reserve方法的2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: serializeString
inline void serializeString(SF::Archive & ar, std::basic_string<C,T,A> & s)
{
if (ar.isRead())
{
boost::uint32_t count = 0;
ar & count;
SF::IStream &is = *ar.getIstream();
s.resize(0);
std::size_t minSerializedLength = sizeof(C);
if (ar.verifyAgainstArchiveSize(count*minSerializedLength))
{
if (count > s.capacity())
{
s.reserve(count);
}
}
boost::uint32_t charsRemaining = count;
const boost::uint32_t BufferSize = 512;
C buffer[BufferSize];
while (charsRemaining)
{
boost::uint32_t charsToRead = RCF_MIN(BufferSize, charsRemaining);
boost::uint32_t bytesToRead = charsToRead*sizeof(C);
RCF_VERIFY(
is.read( (char *) buffer, bytesToRead) == bytesToRead,
RCF::Exception(RCF::_SfError_ReadFailure()))
(bytesToRead)(BufferSize)(count);
s.append(buffer, charsToRead);
charsRemaining -= charsToRead;
}
}
else if (ar.isWrite())
{
boost::uint32_t count = static_cast<boost::uint32_t >(s.length());
ar & count;
ar.getOstream()->writeRaw(
(char *) s.c_str(),
count*sizeof(C));
}
}示例2: unescape_wide_string
void unescape_wide_string(
const std::string &src,
std::basic_string<unsigned int> &dest)
{
dest.reserve(src.size()); // about that long, but may be shorter
for(unsigned i=0; i<src.size(); i++)
{
unsigned int ch=(unsigned char)src[i];
if(ch=='\\') // escape?
{
i++;
assert(i<src.size()); // backslash can't be last character
ch=(unsigned char)src[i];
switch(ch)
{
case '\\': dest.push_back(ch); break;
case 'n': dest.push_back('\n'); break; /* NL (0x0a) */
case 't': dest.push_back('\t'); break; /* HT (0x09) */
case 'v': dest.push_back('\v'); break; /* VT (0x0b) */
case 'b': dest.push_back('\b'); break; /* BS (0x08) */
case 'r': dest.push_back('\r'); break; /* CR (0x0d) */
case 'f': dest.push_back('\f'); break; /* FF (0x0c) */
case 'a': dest.push_back('\a'); break; /* BEL (0x07) */
case '"': dest.push_back('"'); break;
case '\'': dest.push_back('\''); break;
case 'u': // universal character
case 'U': // universal character
i++;
{
std::string hex;
unsigned count=(ch=='u')?4:8;
hex.reserve(count);
for(; count!=0 && i<src.size(); i++, count--)
hex+=src[i];
// go back
i--;
unsigned int result;
sscanf(hex.c_str(), "%x", &result);
ch=result;
}
dest.push_back(ch);
break;
case 'x': // hex
i++;
{
std::string hex;
while(i<src.size() && isxdigit(src[i]))
{
hex+=src[i];
i++;
}
// go back
i--;
unsigned int result;
sscanf(hex.c_str(), "%x", &result);
ch=result;
}
dest.push_back(ch);
break;
default:
if(isdigit(ch)) // octal
{
std::string octal;
while(i<src.size() && isdigit(src[i]))
{
octal+=src[i];
i++;
}
// go back
i--;
unsigned int result;
sscanf(octal.c_str(), "%o", &result);
ch=result;
dest.push_back(ch);
}
else
{
// Unknown escape sequence.
// Both GCC and CL turn \% into %.
dest.push_back(ch);
}
//.........这里部分代码省略.........