diff --git a/README.md b/README.md index 5bbe5a55..2eba47ef 100644 --- a/README.md +++ b/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 diff --git a/modern_C++_30/.CMakeLists.txt.un~ b/modern_C++_30/.CMakeLists.txt.un~ index a838cfd0..65349bbf 100644 Binary files a/modern_C++_30/.CMakeLists.txt.un~ and b/modern_C++_30/.CMakeLists.txt.un~ differ diff --git a/modern_C++_30/CMakeLists.txt b/modern_C++_30/CMakeLists.txt index c92d48c1..e821b35b 100644 --- a/modern_C++_30/CMakeLists.txt +++ b/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) diff --git a/modern_C++_30/CMakeLists.txt~ b/modern_C++_30/CMakeLists.txt~ deleted file mode 100644 index 10d8f1be..00000000 --- a/modern_C++_30/CMakeLists.txt~ +++ /dev/null @@ -1,29 +0,0 @@ -cmake_minimum_required(VERSION 3.14) -project(Morden_C++) - -set(CMAKE_CXX_STANDARD 11) - -add_executable(heap RAII/heap.cpp) -add_executable(stack RAII/stack.cpp) -add_executable(RAII RAII/RAII.cpp) -add_executable(RAII_fstram RAII/RAII_fstram.cpp) - -add_executable(auto_scope smart_ptr/auto_scope.cpp) -add_executable(unique_ptr smart_ptr/unique_ptr.cpp) -add_executable(unique_ptr_U smart_ptr/unique_ptr_U.cpp) -add_executable(shared_ptr smart_ptr/shared_ptr.cpp) - -add_executable(reference reference/reference.cpp) -add_executable(forward reference/forward.cpp) -add_executable(collapses reference/collapses.cpp) -add_executable(lifetime reference/lifetime.cpp) -add_executable(dontreturnReference reference/don'treturnReference.cpp) - -add_executable(container container1/container.cpp) -add_executable(cont container2/hash.cpp) -add_executable(vector_l container1/vector_l.cpp) -add_executable(priority_queue container2/priority_queue.cpp) -add_executable(relacontainer container2/relacontainer.cpp) -add_executable(unorder container2/unorder.cpp) -add_executable(array container2/array.cpp) -add_executable(exception exception/exception.cpp) diff --git a/modern_C++_30/literalAssert/assert.cpp b/modern_C++_30/literalAssert/assert.cpp new file mode 100644 index 00000000..8bc2d515 --- /dev/null +++ b/modern_C++_30/literalAssert/assert.cpp @@ -0,0 +1,13 @@ +// +// Created by light on 19-12-25. +// + +#include +#include + +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; +} \ No newline at end of file diff --git a/modern_C++_30/literalAssert/default_delete.cpp b/modern_C++_30/literalAssert/default_delete.cpp new file mode 100644 index 00000000..e4f91e00 --- /dev/null +++ b/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; +}; \ No newline at end of file diff --git a/modern_C++_30/literalAssert/literal.cpp b/modern_C++_30/literalAssert/literal.cpp new file mode 100644 index 00000000..a5ea5fe4 --- /dev/null +++ b/modern_C++_30/literalAssert/literal.cpp @@ -0,0 +1,81 @@ +// +// Created by light on 19-12-25. +// + +#include + +#include +#include +#include +#include +#include + +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; +} diff --git a/modern_C++_30/literalAssert/overridefinal.cpp b/modern_C++_30/literalAssert/overridefinal.cpp new file mode 100644 index 00000000..f3fcf7a0 --- /dev/null +++ b/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 +}; \ No newline at end of file