Function template make_proxy
Header:
proxy.h
Module:proxy
Namespace:pro::inline v4
The definitions of make_proxy make use of the following exposition-only function:
template <facade F, class T, class... Args> proxy<F> make-proxy-internal(Args&&... args) { if constexpr (inplace_proxiable_target<T, F>) { return make_proxy_inplace<F, T>(std::forward<Args>(args)...); } else { return allocate_proxy<F, T>(std::allocator<void>{}, std::forward<Args>(args)...); } } // (1) template <facade F, class T, class... Args> proxy<F> make_proxy(Args&&... args); // freestanding-deleted // (2) template <facade F, class T, class U, class... Args> proxy<F> make_proxy(std::initializer_list<U> il, Args&&... args); // freestanding-deleted // (3) template <facade F, class T> proxy<F> make_proxy(T&& value); // freestanding-deleted (1) Equivalent to return make-proxy-internal<F, T>(std::forward<Args>(args)...).
(2) Equivalent to return make-proxy-internal<F, T>(il, std::forward<Args>(args)...).
(3) Equivalent to return make-proxy-internal<F, std::decay_t<T>>(std::forward<T>(value)).
Since 3.3.0: For (1-3), if proxiable_target<std::decay_t<T>, F> is false, the program is ill-formed and diagnostic messages are generated.
Return Value
The constructed proxy object.
Exceptions
Throws any exception thrown by allocation and the constructor of T.
Example
#include <iomanip> #include <iostream> #include <string> #include <proxy/proxy.h> struct Printable : pro::facade_builder // ::add_convention<pro::operator_dispatch<"<<", true>, std::ostream&(std::ostream&) const> // ::build {}; int main() { // From bool pro::proxy<Printable> p1 = pro::make_proxy<Printable>(true); // Prints "true" std::cout << std::boolalpha << *p1 << "\n"; // From int pro::proxy<Printable> p2 = pro::make_proxy<Printable>(123); // Prints "123" std::cout << *p2 << "\n"; // From double pro::proxy<Printable> p3 = pro::make_proxy<Printable>(3.1415926); // Prints "3.1415926000" std::cout << std::fixed << std::setprecision(10) << *p3 << "\n"; // From const char* pro::proxy<Printable> p4 = pro::make_proxy<Printable>("lalala"); // Prints "lalala" std::cout << *p4 << "\n"; // From a in-place constructed string pro::proxy<Printable> p5 = pro::make_proxy<Printable, std::string>(5, 'x'); // Prints "xxxxx" std::cout << *p5 << "\n"; }