标签:操作 sig img point bsp end poi ons ima
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识别变量的type id,返回true或false,举一个简单使用的例子
template <typename T> void type_traits_output(const T& x) { cout << "\ntype traits for type : " << typeid(T).name() << endl; cout << "is_void\t" << is_void<T>::value << endl; cout << "is_integral\t" << is_integral<T>::value << endl; cout << "is_floating_point\t" << is_floating_point<T>::value << endl; cout << "is_arithmetic\t" << is_arithmetic<T>::value << endl; cout << "is_signed\t" << is_signed<T>::value << endl; cout << "is_unsigned\t" << is_unsigned<T>::value << endl; cout << "is_const\t" << is_const<T>::value << endl; cout << "is_volatile\t" << is_volatile<T>::value << endl; cout << "is_class\t" << is_class<T>::value << endl; cout << "is_function\t" << is_function<T>::value << endl; cout << "is_reference\t" << is_reference<T>::value << endl; } int main(int argc, const char * argv[]) { int a = 5; type_traits_output<int>(a); return 0; }
输出结果
具体操作也不做太多解释了,很好理解.更多的Type Traits见
http://www.cplusplus.com/reference/type_traits/
以下是Type Traits的截图
希望会对大家有所帮助
如有不正确的地方请指正
参照<<侯捷 C++新标准 C++11>>
标签:操作 sig img point bsp end poi ons ima
原文地址:http://www.cnblogs.com/LearningTheLoad/p/7266405.html