Detailed Description

template<class... Ts>
struct libcamera::utils::overloaded< Ts >

Helper type for type-matching std::visit() implementations.

Template Parameters

Ts... Template arguments pack of visitors

Expand the template argument pack Ts... to provide overloaded operator() to support type-matching implementations of the visitor design pattern using std::visit().

An example is provided by the C++ standard library documentation in the form of:

template<class... Ts> struct overloaded : Ts... { using Ts::operator()...; };
template<class... Ts> overloaded(Ts...) -> overloaded<Ts...>;
 
using var_t = std::variant<int, long, double, std::string>;
std::vector<var_t> vec = {10, 15l, 1.5, "hello"};
 
for (auto& v: vec) {
    std::visit(overloaded {
        [](auto arg) { std::cout << arg << ' '; },
        [](double arg) { std::cout << std::fixed << arg << ' '; },
        [](const std::string& arg) { std::cout << std::quoted(arg) << ' '; },
    }, v);

Use this helper to implement type-matching visitors using std::visit().

The documentation for this struct was generated from the following file:

include/libcamera/base/utils.h