Unraveling string_view: Basics, Benefits, and Best Practicesand their interoperability • When to use string_view • Using string_view safely • Intro to span • span vs. string_view • Case study of an optimization using string_view. 2Motivation • Consider a Caught with -Wdangling Check out MSVC’s Lifetime Rules of the C++ Core Guidelines (-WLifetime).span: Motivation Consider the following functions void foo(int* arr, int n) { for (int i = 0; i < n; type which can consume all these contiguous containers with a single interface? 36span: Motivation void foo(spans) { for (const auto i : s) { cout << i << ' '; } cout << '\n'; } int arr[] 0 码力 | 61 页 | 1.11 MB | 6 月前3
Regular, Revisiteddata structures and algorithms to work properly. STL vocabulary types such as string_view, span, optional, expected etc., raise new questions regarding values types, whole-part semantics, copies analysis provides us some basis to evaluate non-owning reference parameters types (like string_view and span) in a practical fashion, without discarding Regular design. Titus Winters, 2018 abseil.io/bl Ciura | @ciura_victor - Regular, Revisited 93 Slide Title std::spanC++20 https://en.cppreference.com/w/cpp/container/span Think "array view" as in std::string_view, but mutable on underlying 0 码力 | 180 页 | 19.96 MB | 6 月前3
How Meta Made Debugging Async Code Easier with Coroutines and Senderspool, ctx); unifex::sync_wait(std::move(task)); return 0; }unifex::taskasync_main(unifex::span args, auto &pool, auto &io) { auto jobs = args | views::transform( [io](fs::path fileName) std::printf("Average word length in %s is %g\n", args[i], mean); } }unifex::task async_main(unifex::span args, auto &pool, auto &io) { auto jobs = args | views::transform( [io](fs::path fileName) std::printf("Average word length in %s is %g\n", args[i], mean); } }unifex::task async_main(unifex::span args, auto &pool, auto &io) { auto jobs = args | views::transform( [io](fs::path fileName) 0 码力 | 131 页 | 907.41 KB | 6 月前3
Secrets of C++ Scripting Bindingsconcrete function (not a template) that can take any number of parameters. 1 Type generic_function(std::span); 12 . 11Copyright Jason Turner @le�icus emptycrate.com/idocpp A Generic Function Signature concrete function (not a template) that can take any number of parameters. 1 Type generic_function(std::span ); What should this placeholder Type be? 12 . 11Copyright Jason Turner @le�icus emptycrate concrete function (not a template) that can take any number of parameters. 1 Type generic_function(std::span ); What should this placeholder Type be? It needs to be able to hold all of the types we care 0 码力 | 177 页 | 1.65 MB | 6 月前3
The CSS Handbook
is: p { color: yellow; } Every HTML tag has a corresponding selector, for example: div , span , img . If a selector matches multiple elements, all the elements in the page will be affected selectors. To do so, you separate them with a comma. Example:My dog name is:
<span class="dog-name"> Roger span> p, .dog-name { color: yellow; } You can add spaces in those declarations have a span tag nested inside a p tag, you can target that one without applying the style to a span tag not included in a p tag: 20 <span> Hello! span>My dog name is: <span class="dog-name">
0 码力 | 184 页 | 1.96 MB | 1 年前3
PyMuPDF 1.24.2 Documentationquads. So, to mark span text correctly, its quad must be recovered from the data contained in the line and span dictionary. Do this with the following utility function (new in v1.18.9): span_quad = fitz.r recover_quad(line["dir"], span) annot = page.add_highlight_annot(span_quad) # this will mark the complete span text If you want to mark the complete line or a subset of its spans in one go, use the following above may specify any sub-list of line["spans"]. In the example above, the second to second- to-last span are marked. If omitted, the complete line is taken. 10.10 How to Analyze Font Characteristics To0 码力 | 565 页 | 6.84 MB | 1 年前3
The Beauty and Power of Primitive C++accessor for an Vectorcalled vs: Span vs() { return mbuf->vs; } Stroustrup - "Primitive" - CppCon 2020 14 std::string Flat::String Flat::Span Message descriptor User code access access type initializer type placement new flat type a Span is a range of elementsType mapping • Initializer types: ordinary types to initialize objects in the buffer • char, int32_t, uint32_t, … TimeStamp • char, int32_t, uint32_t, … • Flat::Span , Flat::Span_ref Stroustrup - "Primitive" - CppCon 2020 15 std::string Flat::String Flat::Span User code Message descriptorThe first 0 码力 | 53 页 | 1.03 MB | 6 月前3
Scrapy 1.6 Documentationresponse): for quote in response.css('div.quote'): yield { 'text': quote.css('span.text::text').get(), 'author': quote.xpath('span/small/text()').get(), } (continues on next page) 5 Scrapy Documentation this:<span class="text">“The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking.”span> <span> by Albert class="author">Albert Einstein (about) span>
Hidden Overhead of a Function API24: Use a spanor a span_p to designate a half-open sequence Reason Informal/non-explicit ranges are a source of errors. “use span” + “use a span”: 16 occurrences 110C++20 std::span vs raw pointer pointer and size #include <span> int raw_back(int const* ptr, size_t size) { return ptr[size - 1]; } int span_back(std::span span) { return span[span.size() - 1]; } 111 https://godbolt add eax, DWORD PTR [esp+4] mov eax, DWORD PTR [eax] ret mov ecx, DWORD PTR _span$[esp] mov eax, DWORD PTR _span$[esp-4] mov eax, DWORD PTR [eax+ecx*4-4] ret 0 S P A N 112 ?C++23 std::mdspan 0 码力 | 158 页 | 2.46 MB | 6 月前3
Apache Wicket 8.x Reference Guideclass="center"> <span >Username: span>
<span >Password: span> class="center"> <span >Username: span>
<span >Password: span> component is disabled all the links inside it will be in turn disabled (they will be rendered as <span>) and it can not fire JavaScript events. Class Component provides two getter methods to determine0 码力 | 350 页 | 9.95 MB | 1 年前3共 898 条- 1
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