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@cbsmith
Created November 27, 2012 04:55
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Demonstration of brace initialization as well as variadic templates.
// -*- compile-command: "clang++ -ggdb -o brace_initializer -std=c++0x -stdlib=libc++ brace_initializer.cpp" -*-
#include <string>
#include <ostream>
#include <memory>
#include <iostream>
#include <sstream>
#include <new>
class Foo {
public:
std::ostream& append(std::ostream& aStream) const {
return aStream << "Foo(x: " << x << " y: " << y << ")";
}
long x;
std::string y;
};
std::ostream& operator<<(std::ostream& aStream, const Foo& aFoo) { return aFoo.append(aStream); }
template <typename T, typename... Args>
std::unique_ptr<T> safeCreate(Args... args) {
try {
return std::unique_ptr<T>(new T{args...});
} catch (...) {
return nullptr;
}
}
long long_from_string(const std::string aString) {
std::istringstream buffer;
long value;
buffer >> value;
return value;
}
int main(int argc, const char*const *const argv) {
if (argc < 3) {
return -1;
}
const long x_value = long_from_string(argv[1]);
const std::string y_value = argv[2];
Foo stackFoo = { x_value, y_value };
std::unique_ptr<Foo> heapFoo = safeCreate<Foo>(x_value, y_value);
std::unique_ptr<Foo> justAsGoodFoo(new (std::nothrow) Foo {x_value, y_value});
std::cout << "stackFoo: " << stackFoo << std::endl;
std::cout << "heapFoo: " << *heapFoo << std::endl;
std::cout << "justAsGoodFoo: " << *justAsGoodFoo << std::endl;
return 0;
}
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