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147 lines (115 loc) · 2.38 KB
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// Copyright (c) 2020 by Chrono
//
// g++ compile.cpp -Wall -Werror -std=c++11 -o a.out;./a.out
// g++ compile.cpp -Wall -Werror -std=c++14 -o a.out;./a.out
//
// g++ compile.cpp -DNDEBUG -std=c++11 -o a.out;./a.out
//
// gcc -E -dM - < /dev/null
#include <cassert>
#include <typeinfo>
#include <string>
#include <iostream>
#include <stdexcept>
#include <type_traits>
template<int N>
struct fib
{
static_assert(N >= 0, "N must be postive");
static const int value =
fib<N - 1>::value + fib<N - 2>::value;
};
template<>
struct fib<0>
{
static const int value = 1;
};
template<>
struct fib<1>
{
static const int value = 1;
};
//[[deprecated("deadline:2020-12-31")]] // c++14 or later
[[gnu::deprecated]] // c+11 or later
int old_func()
{
//[[gnu::deprecated("I hate this")]]
int value = 0;
return value;
}
[[gnu::constructor]]
void first_func()
{
// can not use cout!
printf("before main()\n");
}
[[gnu::destructor]]
void last_func()
{
// can not use cout!
printf("after main()\n");
}
[[gnu::always_inline]] inline
int get_num()
{
return 42;
}
[[noreturn]]
int case1(bool flag)
{
throw std::runtime_error("XXX");
}
void case2()
{
using namespace std;
[[gnu::unused]]
int nouse;
cout << "case2" << endl;
}
[[gnu::hot]]
void case3()
{
using namespace std;
cout << "case3" << endl;
}
void case4()
{
static_assert(sizeof(int) == 4, "int must be 32bit");
static_assert(sizeof(long) >= 8, "must run on x64");
}
template<typename T>
void check_type(T v)
{
using namespace std;
static_assert(is_integral<T>::value, "int");
//static_assert(is_pointer<T>::value, "ptr");
//static_assert(is_default_constructible<T>::value, "is_default_constructible");
cout << "static_assert : " << typeid(v).name() << endl;
cout << is_void<void>::value << endl;
}
void case5()
{
int i = 10;
int *p = &i;
assert(i > 0 && "i must be greater than zero");
assert(p != nullptr);
std::string str = "hello";
assert(!str.empty());
}
int main()
{
using namespace std;
cout << fib<2>::value << endl;
cout << fib<3>::value << endl;
cout << fib<4>::value << endl;
cout << fib<5>::value << endl;
old_func();
get_num();
case2();
case3();
case4();
case5();
check_type(10);
//check_type((void*)0);
cout << "compile stage demo" << endl;
}