diff options
Diffstat (limited to 'c++.html.markdown')
| -rw-r--r-- | c++.html.markdown | 84 |
1 files changed, 50 insertions, 34 deletions
diff --git a/c++.html.markdown b/c++.html.markdown index 8a7f5a59..8ee964ca 100644 --- a/c++.html.markdown +++ b/c++.html.markdown @@ -5,6 +5,7 @@ contributors: - ["Steven Basart", "http://github.com/xksteven"] - ["Matt Kline", "https://github.com/mrkline"] - ["Geoff Liu", "http://geoffliu.me"] + - ["Connor Waters", "http://github.com/connorwaters"] lang: en --- @@ -53,11 +54,11 @@ int main(int argc, char** argv) // However, C++ varies in some of the following ways: -// In C++, character literals are one byte. -sizeof('c') == 1 +// In C++, character literals are chars +sizeof('c') == sizeof(char) == 1 -// In C, character literals are the same size as ints. -sizeof('c') == sizeof(10) +// In C, character literals are ints +sizeof('c') == sizeof(int) // C++ has strict prototyping @@ -159,9 +160,9 @@ void foo() int main() { - // Includes all symbols from `namesapce Second` into the current scope. Note - // that simply `foo()` no longer works, since it is now ambiguous whether - // we're calling the `foo` in `namespace Second` or the top level. + // Includes all symbols from namespace Second into the current scope. Note + // that simply foo() no longer works, since it is now ambiguous whether + // we're calling the foo in namespace Second or the top level. using namespace Second; Second::foo(); // prints "This is Second::foo" @@ -244,7 +245,13 @@ cout << fooRef; // Prints "I am foo. Hi!" // Doesn't reassign "fooRef". This is the same as "foo = bar", and // foo == "I am bar" // after this line. +cout << &fooRef << endl; //Prints the address of foo fooRef = bar; +cout << &fooRef << endl; //Still prints the address of foo +cout << fooRef; // Prints "I am bar" + +//The address of fooRef remains the same, i.e. it is still referring to foo. + const string& barRef = bar; // Create a const reference to bar. // Like C, const values (and pointers and references) cannot be modified. @@ -256,7 +263,7 @@ string tempObjectFun() { ... } string retVal = tempObjectFun(); // What happens in the second line is actually: -// - a string object is returned from `tempObjectFun` +// - a string object is returned from tempObjectFun // - a new string is constructed with the returned object as arugment to the // constructor // - the returned object is destroyed @@ -268,15 +275,15 @@ string retVal = tempObjectFun(); // code: foo(bar(tempObjectFun())) -// assuming `foo` and `bar` exist, the object returned from `tempObjectFun` is -// passed to `bar`, and it is destroyed before `foo` is called. +// assuming foo and bar exist, the object returned from tempObjectFun is +// passed to bar, and it is destroyed before foo is called. // Now back to references. The exception to the "at the end of the enclosing // expression" rule is if a temporary object is bound to a const reference, in // which case its life gets extended to the current scope: void constReferenceTempObjectFun() { - // `constRef` gets the temporary object, and it is valid until the end of this + // constRef gets the temporary object, and it is valid until the end of this // function. const string& constRef = tempObjectFun(); ... @@ -301,7 +308,7 @@ basic_string(basic_string&& other); // Idea being if we are constructing a new string from a temporary object (which // is going to be destroyed soon anyway), we can have a more efficient // constructor that "salvages" parts of that temporary string. You will see this -// concept referred to as the move semantic. +// concept referred to as "move semantics". ////////////////////////////////////////// // Classes and object-oriented programming @@ -349,7 +356,10 @@ public: // These are called when an object is deleted or falls out of scope. // This enables powerful paradigms such as RAII // (see below) - // Destructors must be virtual to allow classes to be derived from this one. + // The destructor should be virtual if a class is to be derived from; + // if it is not virtual, then the derived class' destructor will + // not be called if the object is destroyed through a base-class reference + // or pointer. virtual ~Dog(); }; // A semicolon must follow the class definition. @@ -492,9 +502,10 @@ int main () { ///////////////////// // Templates in C++ are mostly used for generic programming, though they are -// much more powerful than generics constructs in other languages. It also -// supports explicit and partial specialization, functional-style type classes, -// and also it's Turing-complete. +// much more powerful than generic constructs in other languages. They also +// support explicit and partial specialization and functional-style type +// classes; in fact, they are a Turing-complete functional language embedded +// in C++! // We start with the kind of generic programming you might be familiar with. To // define a class or function that takes a type parameter: @@ -506,7 +517,7 @@ public: }; // During compilation, the compiler actually generates copies of each template -// with parameters substituted, and so the full definition of the class must be +// with parameters substituted, so the full definition of the class must be // present at each invocation. This is why you will see template classes defined // entirely in header files. @@ -520,13 +531,13 @@ intBox.insert(123); Box<Box<int> > boxOfBox; boxOfBox.insert(intBox); -// Up until C++11, you must place a space between the two '>'s, otherwise '>>' -// will be parsed as the right shift operator. +// Until C++11, you had to place a space between the two '>'s, otherwise '>>' +// would be parsed as the right shift operator. // You will sometimes see // template<typename T> -// instead. The 'class' keyword and 'typename' keyword are _mostly_ -// interchangeable in this case. For full explanation, see +// instead. The 'class' keyword and 'typename' keywords are _mostly_ +// interchangeable in this case. For the full explanation, see // http://en.wikipedia.org/wiki/Typename // (yes, that keyword has its own Wikipedia page). @@ -582,12 +593,15 @@ try { // Do not allocate exceptions on the heap using _new_. throw std::runtime_error("A problem occurred"); } + // Catch exceptions by const reference if they are objects catch (const std::exception& ex) { - std::cout << ex.what(); + std::cout << ex.what(); +} + // Catches any exception not caught by previous _catch_ blocks -} catch (...) +catch (...) { std::cout << "Unknown exception caught"; throw; // Re-throws the exception @@ -597,8 +611,8 @@ catch (const std::exception& ex) // RAII /////// -// RAII stands for Resource Allocation Is Initialization. -// It is often considered the most powerful paradigm in C++, +// RAII stands for "Resource Acquisition Is Initialization". +// It is often considered the most powerful paradigm in C++ // and is the simple concept that a constructor for an object // acquires that object's resources and the destructor releases them. @@ -619,9 +633,9 @@ void doSomethingWithAFile(const char* filename) // Unfortunately, things are quickly complicated by error handling. // Suppose fopen can fail, and that doSomethingWithTheFile and // doSomethingElseWithIt return error codes if they fail. -// (Exceptions are the preferred way of handling failure, -// but some programmers, especially those with a C background, -// disagree on the utility of exceptions). +// (Exceptions are the preferred way of handling failure, +// but some programmers, especially those with a C background, +// disagree on the utility of exceptions). // We now have to check each call for failure and close the file handle // if a problem occurred. bool doSomethingWithAFile(const char* filename) @@ -741,15 +755,17 @@ class FooSub : public Foo { // 0 == false == NULL (most of the time)! bool* pt = new bool; -*pt = 0; // Sets the value points by 'pt' to false. +*pt = 0; // Sets the value points by 'pt' to false. pt = 0; // Sets 'pt' to the null pointer. Both lines compile without warnings. // nullptr is supposed to fix some of that issue: int* pt2 = new int; -*pt2 = nullptr; // Doesn't compile +*pt2 = nullptr; // Doesn't compile pt2 = nullptr; // Sets pt2 to null. -// But somehow 'bool' type is an exception (this is to make `if (ptr)` compile). +// There is an exception made for bools. +// This is to allow you to test for null pointers with if(!ptr), +// but as a consequence you can assign nullptr to a bool directly! *pt = nullptr; // This still compiles, even though '*pt' is a bool! @@ -776,12 +792,12 @@ vector<Foo> v; for (int i = 0; i < 10; ++i) v.push_back(Foo()); -// Following line sets size of v to 0, but destructors don't get called, +// Following line sets size of v to 0, but destructors don't get called // and resources aren't released! v.empty(); -v.push_back(Foo()); // New value is copied into the first Foo we inserted in the loop. +v.push_back(Foo()); // New value is copied into the first Foo we inserted -// Truly destroys all values in v. See section about temporary object for +// Truly destroys all values in v. See section about temporary objects for // explanation of why this works. v.swap(vector<Foo>()); |