c++.stlsoft - platformstl::memory_mapped_file + stlsoft::basic_string_view example
- Matthew (321/322) Mar 28 2005 Chris, et al.
"Matthew" <admin stlsoft.dot.dot.dot.dot.org>
Chris, et al.
Here's an example project demonstrating the use of PlatformSTL's
memory_mapped_file with STLSoft's string_view.
The bit to note is that, in the code extract shown below, there is not a single
memory allocation (or no call to
::operator new(), at least), outside the call to the operating system's mmap()
(or equiv.). That's pretty good, eh? :-)
You'll also need to put in the new integer_to_string.hpp in
"$(STLSOFT_INCLUDE)/inprogress/stlsoft".
Cheers
Matthew
<code>
/* . */
if(NULL == inputFileName)
{
usage(1, "Must specify file to process", -1, argc, argv);
}
else
{
// Define the local string type: a string_view on char type
typedef ::stlsoft::basic_string_view<char> string_view_t;
// Declare the mem-map file and string view variables
::platformstl::memory_mapped_file mmf(inputFileName);
string_view_t sv(static_cast<char const
*>(mmf.memory()), mmf.size());
// Now we'll do things with it
// 0. Define the delimiter for the ambient operating system
#if defined(PLATFORMSTL_OS_IS_UNIX)
const string_view_t delimiter("\n", 1);
#elif defined(PLATFORMSTL_OS_IS_WIN32)
const string_view_t delimiter("\r\n", 2);
#else
#endif /* platform */
// 1. Count the number of chars
{
size_t numChars = std::distance(sv.begin(), sv.end());
cout << "Number of characters: " << numChars << endl;
}
// 2. Count the number of lines (using stlsoft::string_tokeniser)
{
typedef ::stlsoft::string_tokeniser< string_view_t
, string_view_t
, ::stlsoft::string_tokeniser_ignore_blanks<false>
> tokeniser_keep_blanks_t;
tokeniser_keep_blanks_t lines(sv.begin(), sv.end(), delimiter);
size_t numLines = ::std::distance(lines.begin(),
lines.end());
cout << "Number of lines: " << numLines << endl;
}
// 3. Count the number of non-blank lines (using stlsoft::string_tokeniser)
{
typedef ::stlsoft::string_tokeniser< string_view_t
, string_view_t
> tokeniser_t;
tokeniser_t lines(sv.begin(), sv.end(), delimiter);
size_t numLines = ::std::distance(lines.begin(), lines.end());
cout << "Number of lines (non-blank): " << numLines << endl;
}
// 4. Count the number of lines (using stlsoft::string_tokeniser + rangelib
stuff)
{
typedef ::stlsoft::string_tokeniser< string_view_t
, string_view_t
, ::stlsoft::string_tokeniser_ignore_blanks<false>
> tokeniser_keep_blanks_t;
size_t numLines =
::rangelib::r_distance(rangelib::make_sequence_range(tokeniser_keep_
lanks_t(sv.begin(),
sv.end(), delimiter)));
cout << "Number of lines (R): " << numLines << endl;
}
// 5. Count the number of lines (using stlsoft::string_tokeniser + rangelib
stuff)
{
typedef ::stlsoft::string_tokeniser< string_view_t
, string_view_t
> tokeniser_t;
size_t numLines =
::rangelib::r_distance(rangelib::make_sequence_range(tokeniser_t(sv.begin(),
sv.end(),
delimiter)));
cout << "Number of lines (non-blank) (R): " << numLines << endl;
}
// 6. Display each line, indexed (using stlsoft::string_tokeniser +
rangelib stuff)
{
typedef ::stlsoft::string_tokeniser< string_view_t
, string_view_t
, ::stlsoft::string_tokeniser_ignore_blanks<false>
> tokeniser_t;
typedef ::rangelib::sequence_range< tokeniser_t>
tokenised_sequence_t;
typedef ::rangelib::indexed_range< tokenised_sequence_t
, size_t
> indexed_tokenised_sequence_t;
indexed_tokenised_sequence_t
ir(tokenised_sequence_t(tokeniser_t(sv.begin(), sv.end(), delimiter)));
cout << "Lines:" << endl;
for(; ir; ++ir)
{
cout << ir.index() << ": " << *ir << endl;
}
}
}
</code>
begin 666 integer_to_string.hpp
H(VEN8VQU9&4 /'-T;'-O9G1?:6YT96=E<E]T;U]S=')I;F<N:#X-" ``
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end
begin 666 string_view_test.zip
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end
Mar 28 2005