C++

Suppose you have a class declare in a namespace, like this: #pragma once namespace Test { class foo { public: foo(void); ~foo(void); }; }; #include “foo.h” namespace Test { foo::foo(void) { } foo::~foo(void) { } }; And you want to use that foo class in a another class, with a forward declaration: #pragma once class … Read more

STL’s std::string doesn’t have methods for transforming the string to upper or lower case or for trimming (as other string implementations, such as CString, have). I’ve noticed that many people don’t know how to implement such functions, so I’ll show you here how to do that. class stringutils { public: static void make_upper(std::string& text) { … Read more

Consider the following C++ code: void foo(int a, int b, int c) { std::cout << a << ‘ ‘ << b << ‘ ‘ << c << std::endl; } int main(int argc, char* argv[]) { int value = 1; foo(value++, value++, value++); return 0; } That looks pretty straight-forward: there is a function that takes … Read more

The C++ standard, specifies in the paragraph 23.1.10 that swapping two containers should not invalidate any references, pointers or iterators refering to the elements of the containers being swapped. Unfortunatelly, that is not the case of the VC++ 2005 implementation. Imagine the following case: std::vector vec1; vec1.push_back(1); vec1.push_back(2); vec1.push_back(3); std::vector vec2; vec2.push_back(10); vec2.push_back(20); std::vector::iterator it1 = vec1.begin(); … Read more