Mercurial > minori
view dep/pugixml/docs/samples/load_memory.cpp @ 187:9613d72b097e
*: multiple performance improvements
like marking `static const` when it makes sense...
date: change old stupid heap-based method to a structure which should
make copying the thing actually make a copy.
also many performance-based changes, like removing the std::tie
dependency and forward-declaring nlohmann json
*: replace every instance of QString::fromUtf8 to Strings::ToQString.
the main difference is that our function will always convert exactly
what is in the string, while some other times it would only convert
up to the nearest NUL byte
| author | Paper <mrpapersonic@gmail.com> |
|---|---|
| date | Wed, 06 Dec 2023 13:43:54 -0500 |
| parents | d10b6c6b432e |
| children |
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#include "pugixml.hpp" #include <iostream> #include <cstring> int main() { // tag::decl[] const char source[] = "<mesh name='sphere'><bounds>0 0 1 1</bounds></mesh>"; size_t size = sizeof(source); // end::decl[] pugi::xml_document doc; { // tag::load_buffer[] // You can use load_buffer to load document from immutable memory block: pugi::xml_parse_result result = doc.load_buffer(source, size); // end::load_buffer[] std::cout << "Load result: " << result.description() << ", mesh name: " << doc.child("mesh").attribute("name").value() << std::endl; } { // tag::load_buffer_inplace_begin[] // You can use load_buffer_inplace to load document from mutable memory block; the block's lifetime must exceed that of document char* buffer = new char[size]; memcpy(buffer, source, size); // The block can be allocated by any method; the block is modified during parsing pugi::xml_parse_result result = doc.load_buffer_inplace(buffer, size); // end::load_buffer_inplace_begin[] std::cout << "Load result: " << result.description() << ", mesh name: " << doc.child("mesh").attribute("name").value() << std::endl; // tag::load_buffer_inplace_end[] // You have to destroy the block yourself after the document is no longer used delete[] buffer; // end::load_buffer_inplace_end[] } { // tag::load_buffer_inplace_own[] // You can use load_buffer_inplace_own to load document from mutable memory block and to pass the ownership of this block // The block has to be allocated via pugixml allocation function - using i.e. operator new here is incorrect char* buffer = static_cast<char*>(pugi::get_memory_allocation_function()(size)); memcpy(buffer, source, size); // The block will be deleted by the document pugi::xml_parse_result result = doc.load_buffer_inplace_own(buffer, size); // end::load_buffer_inplace_own[] std::cout << "Load result: " << result.description() << ", mesh name: " << doc.child("mesh").attribute("name").value() << std::endl; } { // tag::load_string[] // You can use load to load document from null-terminated strings, for example literals: pugi::xml_parse_result result = doc.load_string("<mesh name='sphere'><bounds>0 0 1 1</bounds></mesh>"); // end::load_string[] std::cout << "Load result: " << result.description() << ", mesh name: " << doc.child("mesh").attribute("name").value() << std::endl; } } // vim:et
