The Surprising Costs of Voidvoid() member functions There’s nothing inherently evil about void functions void greeting() { cout << "I love my teacher" << endl; } int main() { greeting(); // Ok, innocuous initializations Consider int main() { int n = 0; if (cin >> n && is_odd(n)) cout << "How odd to see " << n << endl; } ## The case of the unnecessary initializations initializations Consider int main() { int n = 0; if(cin >> n && is_odd(n)) cout << "How odd to see " << n << endl; ## The case of the unnecessary initializations0 码力 | 189 页 | 60.10 MB | 1 年前3- Taming the C++ Filter Viewprint(const T& coll) { for (const auto& elem : coll) { std::cout << elem << ' "; } std::cout << '\n'; } std::vector
coll1{0, 8, 15, 47, 11, 42 void print(const auto& coll) { for (const auto& elem : coll) { std::cout << elem << ' "; } std::cout << '\n'; } std::vector coll1{0, 8, 15, 47, 11, 42, 1}; auto& coll) { for (const auto& elem : coll) { std::cout << elem << ' "; } std::cout << '\n'; } std::vector col11{0, 8, 15, 47, 11, 42 0 码力 | 43 页 | 2.77 MB | 1 年前3 - Back to Basics: Pointers
5 int main() { int x = 7; int* px = &x; std::cout << "x is: " << x << std::endl; std::cout << *px is: " << *px << std::endl; return 5 int main() { int x = 7; int* px = &x; std::cout << "x is: " << x << std::endl; std::cout << *px is: " << *px << std::endl; return -o prog 3 #include 5 int main() { int x = 7; $$ int*px=\&x; $$ std::cout std::cout "x is: " << x << std::endl; "*px is: " << *px << std::endl; 0 码力 | 152 页 | 5.61 MB | 1 年前3 
C++高性能并行编程与优化 - 课件 - 13 C++ STL 容器全解之 vector5, 7}; auto n = std::count_if(a.begin(), a.end(), std::bind2nd(std::less(), 4)); std::cout << n << std::endl; return 0; } 5, 7}; auto n = std::count_if(a.begin(), a.end(), std::bind2nd(std::less(), 4)); std::cout << n << std::endl; return 0; } 5, 7}; auto n = std::count_if(a.begin(), a.end(), std::bind2nd(std::less(), 4)); std::cout << n << std::endl; return 0; } 0 码力 | 90 页 | 4.93 MB | 2 年前3- Object Lifetime: From Start to FinishConstructors & Destructors 1 struct Foo { 2 Foo() { std::cout << "Foo()" << std::endl; } 3 ~Foo() { std::cout << "~Foo()" << std::endl; } 4 }; 5 6 int main() ## Constructors & Destructors struct Foo { Foo() { std::cout << "Foo() << std::endl; } ~Foo() { std::cout <<%~Foo() << std::endl; } }; int main() { Foo a; ## Constructors & Destructors struct Foo { Foo() { std::cout << "Foo() << std::endl; } ~Foo() { std::cout <<%~Foo() << std::endl; } }; int main() { Foo a; //0 码力 | 214 页 | 9.34 MB | 1 年前3
- Modern C++ Tutorial: C++11/14/17/20 On the Fly#include "foo.h" #include
#include int main() { [out = std::ref(std::cout << "Result from C code: " << add(1, 2))]() { out.get() << " probably still don’t understand the following small piece of code above, namely: [out = std::ref(std::cout << "Result from C code: " << add(1, 2))]() { out.get() << ".\n"; decltype(0)="">::value) std::cout << "NULL == 0" << std::endl; if (std::is_same 0 码力 | 92 页 | 1.79 MB | 2 年前3 - Modern C++ Iterators= {10, 20, 30, 40}; // iterate over elements with index: for (int i = 0; i < 4; ++i) { std::cout << arr[i] << '\n'; // iterate over elements with pointer:  for (int* p = arr; p < arr + 4; ++p) { std::cout << *p << '\n'; int* p = arr + 4; // OK std::cout << *p; // Undefined Behavior C++ josuttis | eckstein 4 begin() til end() int arr[] = {10, 20, 30, 40}; for (int* p = arr; p < arr + 4; ++p) { std::cout << *p << '\n'; }  { cout << "A::Foo()" } void Bar() { Foo(); } }; struct B : A { int b}; string str2}; B() { Bar(); ... } virtual ~B() { Bar(); ... } virtual void Foo() { cout << c}; string str3}; C() { Bar(); ... } virtual ~C() { Bar(); ... } virtual void Foo() { cout << "C::Foo()" } }; ## C++ Under the Hood - v table ptr struct A { hidden v_table* string str1{}; A() { Bar(); ... } virtual ~A() { Bar(); ... } virtual void Foo() { cout << "A::Foo()" } void Bar() { Foo(); } }; struct B : A { int b{}; string0 码力 | 168 页 | 13.55 MB | 1 年前3
- Back To Basics Lifetime ManagementGadget { public: int i; }; Gadget gadget; std::cout << gadget.i << "\n"; struct Gadget { int i; }; Gadget gadget; std::cout << gadget.i << "\n"; struct Gadget : i(0) {} }; Gadget gadget; std::cout << gadget.i << "\n"; struct Gadget { int i = 0; }; default member initializer Gadget gadget; std::cout << gadget.i << "\n"; "\n"; struct Gadget { int i; Gadget(int i) : i(i) {} }; Gadget gadget(42); std::cout << gadget.i << "\n"; struct Gadget { int i; Gadget(int i) : i(i) {} }; Gadget0 码力 | 66 页 | 8.43 MB | 1 年前3
- 现代C++ 教程：高速上手C++11/14/17/20#include "foo.h" #include
#include int main() { [out = std::ref(std::cout << "Result from C code: " << add(1, 2))]() { out.get() << " 的在命令行中使用 clang++ -std=c++2a 也可以阅读本书。 如果你是首次接触现代 C++，那么你很可能还看不懂上面的那一小段代码，即： [out = std::ref(std::cout << "Result from C code: " << add(1, 2))]() { out.get() << ".\n"; decltype(0)="">::value) std::cout << "NULL == 0" << std::endl; if (std::is_same 0 码力 | 83 页 | 2.42 MB | 2 年前3
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