This commit is contained in:
Light-City
2019-12-25 21:06:30 +08:00
parent 8544284f51
commit 095ebc9011
8 changed files with 148 additions and 29 deletions

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//
// Created by light on 19-12-25.
//
#include <iostream>
#include <cassert>
int main() {
const int alignment=5;
assert((alignment & (alignment - 1)) == 0);
static_assert((alignment & (alignment - 1)) == 0, "Alignment must be power of two");
return 0;
}

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//
// Created by light on 19-12-25.
//
class myFun {
public:
myFun() = default;
myFun(const myFun &) = default;
myFun &operator=(const myFun &) = default;
myFun(myFun &&) = delete;
myFun &operator=(myFun &&) = delete;
~myFun() = default;
};

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//
// Created by light on 19-12-25.
//
#include <chrono>
#include <complex>
#include <iostream>
#include <string>
#include <thread>
#include <bitset>
using namespace std::literals::chrono_literals;
using namespace std::literals::string_literals;
using namespace std::literals::complex_literals;
struct length {
double value;
enum unit {
metre,
kilometre,
millimetre,
centimetre,
inch,
foot,
yard,
mile,
};
static constexpr double factors[] =
{1.0, 1000.0, 1e-3,
1e-2, 0.0254, 0.3048,
0.9144, 1609.344};
explicit length(double v,
unit u = metre) {
value = v * factors[u];
}
};
length operator+(length lhs,
length rhs) {
return length(lhs.value +
rhs.value);
}
length operator "" _m(long double v) { return length(v, length::metre); }
length operator "" _cm(long double v) { return length(v, length::centimetre); }
// 可能有其他运算符
int main() {
std::cout << "i * i = " << 1i * 1i << std::endl;
std::cout << "Waiting for 500ms" << std::endl;
std::this_thread::sleep_for(500ms);
std::cout << "Hello world"s.substr(0, 5) << std::endl;
length l1 = length(1.0, length::metre);
length l2 = length(1.0, length::centimetre);
std::cout << l2.value << std::endl;
std::cout << (l1 + l2).value << std::endl;
// 1.0_m + 10.0_cm
std::cout << (1.0_m + 1.0_cm).value << std::endl;
// 二进制字面量
unsigned mask = 0b1101;
// 以十进制打印
std::cout << mask << std::endl;
// 打印二进制字面量
std::cout << std::bitset<4>(mask) << std::endl;
// 数字分隔符
unsigned mk = 0b111'000'000;
double pi = 3.141'5926;
return 0;
}

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//
// Created by light on 19-12-25.
//
class A {
public:
virtual void foo();
virtual void bar();
void foobar();
};
class B : public A {
public:
void foo() override; // OK
void bar() override final; // OK
//void foobar() override;
// 非虚函数不能 override
};
class C final : public B {
public:
void foo() override; // OK
//void bar() override;
// final 函数不可 override
};
class D : public C {
// 错误final 类不可派生
};