©2024 by josuttis.com 1 C++ Nicolai M. Josuttis josuttis.com @NicoJosuttis Taming the C++ Filter View September 17, 2024 16:45 - 17:45 MDT ©2024 by josuttis.com 2 C++ Nicolai M. Josuttis • Independent Other Topics: – Systems Architect – Technical Manager – SOA – X and OSF/Motif Nico Josuttis C++ Filter View @cppcon 2024-09-17 1©2024 by josuttis.com 3 C++ Views C++20 ©2024 by josuttis.com 4 C++ print(coll2); Output: 0 8 15 47 11 42 1 0 1 8 11 15 42 47 C++20 template Nico Josuttis C++ Filter View @cppcon 2024-09-17 2©2024 by josuttis.com 5 C++ C++20: Views void print(const auto& coll)

employees, FilterFunction filter) { std::vector filteredEmployees; std::copy_if(begin(employees), end(employees), std::back_inserter(filteredEmployees),filter); return filteredEmployees; employees, FilterFunction filter) { std::vector filteredEmployees; std::copy_if(begin(employees), end(employees), std::back_inserter(filteredEmployees),filter); return filteredEmployees; employees, FilterFunction filter) { std::vector filteredEmployees; std::copy_if(begin(employees), end(employees), std::back_inserter(filteredEmployees),filter); return filteredEmployees;

ServletContext，默认使用 IniWebEnvironment 实现。 <filter> <filter-name>iniShiroFilterfilter-name> <filter-class>org.apache.shiro.web.servlet.IniShiroFilterfilter-class> filter> <filter-mapping> <filter-name>iniShiroFilterfilter-name> /* filter-mapping> config 集成 DelegatingFilterProxy 作用是自动到 spring 容器查找名字为 shiroFilter（filter-name）的 bean 并把所有 Filter 的操作委托给它。然后将 ShiroFilter 配置到 spring 容器即可： 最后不要忘了使用 org.springframework.web

std::vector{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; std::vector const results = inputs | ranges::view::filter([](int i){ return i % 3 == 0; }) | ranges::view::transform([](int i){ return i * 2; }); auto ranges::view::transform([](int i){ return i * 2; }) | ranges::view::filter([](int i){ return i % 3 == 0; }); transform-filter6 RANGES auto const inputs = std::vector{1, 2, 3, 4, 5, 6, 7, 8, ranges::view::transform([](int i){ return i * 2; }) | ranges::view::filter([](int i){ return i % 3 == 0; }); transform-filter7 RANGES auto const inputs = std::vector{1, 2, 3, 4, 5, 6}; std::vector

(potentially infinitely large!)(im)Pure Functions ● Here is a simple implementation of a smoothing filter std::string get_timestamp() { std::time_t t = std::time(nullptr); std::tm tm = *std::localtime(&t); [INFO] " << message << '\n'; } auto filter = [x_previous = 0.] (double xn) mutable -> double { /* Implementation code */ x_previous = xn; return yn; }; void filter_timeseries(std::vector const& push_back(f(xn)); } } int main() { auto f = filter; f(1); // 0.7 f(1); // 1.0 std::vector const x = {1, 1, 1}; std::vector y; filter_timeseries(x, y); }(im)Pure Functions ● Here

fern::Consumer({ A ( x * StrideArg, y * StrideArg, len x + filter.W - 1, len y + filter.H - 1) }) )) template void conv(image input, image filter, int StrideArg, image out);Convolution Input fern::Consumer({ A ( x * StrideArg, y * StrideArg, len x + filter.W - 1, len y + filter.H - 1) }) )) template void conv(image input, image filter, int StrideArg, image out); }) )) template fern::Consumer({ A ( x * StrideArg, y * StrideArg, len x + filter.W - 1, len y + filter.H - 1) }) )) template void conv(image input, image filter, int StrideArg, image out);Convolution Input

Jacob Rice jacob.rice.cpp@gmail.com 2🎉🎆🎊 using namespace std::views; for (int i : iota(2) | filter(even) | transform(square)) std::cout << i << ' '; 1 2 3 456template concept GravitationalBody create; “real” work is done during iteration. 20for for ( (int int i : i : iota iota(2) | ) | filter filter(even) | (even) | transform transform(square)) (square)) using namespace std::views; 1 2 Only 4 in the standard. using namespace std::ranges; auto a = ref_view{ some_vect }; auto b = filter_view{ a, even }; using namespace std::ranges; auto a = iota_view{ 1, 10 }; auto b = istream_view{

wstring filter, [in] unsigned long flags, [in] wstring userName, [in] wstring password) directory Directory to read. filter Directory filter (DOS style wildcards). Set to empty string if no filter required filters from this list are applied to it (in order they are stored in the list). The first matched filter will determine the action performed on the device. Unless the device is ignored by these filters name Filter name. See IUSBDeviceFilter::name for more information. Creates a new USB device filter. All attributes except the filter name are set to empty (any match), active is false (the filter is not

(read-only) wstring IDirectory::directoryName Full path of directory. 5.15.1.2 filter (read-only) wstring IDirectory::filter The open filter. 5.15.2 close void IDirectory::close() Closes this directory. After closing IGuestSession::directoryOpen( [in] wstring path, [in] wstring filter, [in] DirectoryOpenFlag flags[]) path Full path to file to open. filter Open filter to apply. This can include wildcards like ? and *. flags filters from this list are applied to it (in order they are stored in the list). The first matched filter will determine the action performed on the device. Unless the device is ignored by these filters

with More Columns · · · · · 891 6.5.3 Filter Binlog Events· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 898 6.5.4 Filter DML Events Using SQL Expressions · · · Prechecks · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 3050 13.7.11 Table Filter · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 5229 14.16 Table Filter · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·