update

README.md

@@ -142,6 +142,7 @@ for(decl:col) {
 - [容器1](./modern_C++_30/container1)
 - [容器2](./modern_C++_30/container2)
 - [异常](./modern_C++_30/exception)
+- [字面量、静态断言和成员函数说明符](./modern_C++_30/literalAssert)
 - [是不是应该返回对象？](./modern_C++_30/returnObj)
 
 ### 4.拓展部分

modern_C++_30/CMakeLists.txt

@@ -35,3 +35,8 @@ add_executable(returnObj3 returnObj/returnObj3.cpp)
 add_executable(returnObj4 returnObj/returnObj4.cpp)
 add_executable(returnObj5 returnObj/returnObj5.cpp)
 add_executable(rvonrvo returnObj/all.cpp)
+
+add_executable(literal literalAssert/literal.cpp)
+add_executable(assert literalAssert/assert.cpp)
+add_executable(default_delete literalAssert/default_delete.cpp)
+add_executable(overridefinal literalAssert/overridefinal.cpp)

modern_C++_30/literalAssert/assert.cpp

@@ -0,0 +1,13 @@
+//
+// 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;
+}

modern_C++_30/literalAssert/default_delete.cpp

@@ -0,0 +1,18 @@
+//
+// 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;
+};

modern_C++_30/literalAssert/literal.cpp

@@ -0,0 +1,81 @@
+//
+// 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;
+}

modern_C++_30/literalAssert/overridefinal.cpp

@@ -0,0 +1,30 @@
+//
+// 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
+};