元编程: is_floating

判断是否为浮点数类型

#include <iostream>
#include <string>
#include <functional>
#include <type_traits>void void_print()
{return;
}bool bool_print()
{return false;
}char char_print()
{return 'a';
}unsigned char uchar_print()
{return static_cast<unsigned char>(10);
}short short_print()
{return 100;
}unsigned short ushort_print()
{return 100;
}int int_print()
{return -1;
}unsigned int uint_print()
{return 0;
}long long_print()
{return 10;
}unsigned long ulong_print()
{return 10;
}long long longlong_print()
{return 10;
}unsigned long long ulonglong_print()
{return 10;
}float float_print()
{return 1.0f;
}double double_print()
{return 1.0;
}std::string string_print()
{return std::string("abc");
}const char* chs = "const char";
const char* const_char_print()
{return chs;
}class A
{
public:A(){a = false;b = 'a';c = static_cast<unsigned char>(10);d = 11;e = 12;f = 1;g = 2;h = 3;i = 4;j = 5;k = 6;l = 7.0f;m = 8.0;n = "std::string";o = "const char";}virtual ~A(){std::cout << __FUNCTION__ << ": " << __LINE__ << ": run here " << std::endl;}void void_print(){return;}bool bool_print(){return a;}char char_print(){return b;}unsigned char uchar_print(){return c;}short short_print(){return d;}unsigned short ushort_print(){return e;}int int_print(){return f;}unsigned int uint_print(){return g;}long long_print(){return h;}unsigned long ulong_print(){return i;}long long longlong_print(){return j;}unsigned long long ulonglong_print(){return k;}float float_print(){return l;}double double_print(){return m;}std::string string_print(){return n;}const char* const_char_print(){return o;}public:virtual A* creat_object(){return new A();}virtual std::string print_typename(){return std::string("A");}public:bool a;char b;unsigned char c;short d;unsigned short e;int f;unsigned int g;long h;unsigned long i;long long j;unsigned long long k;float l;double m;std::string n;const char* o;
};class B : public A
{
public:B() : A(){}public:virtual A* create_object(){return new B();}virtual std::string print_typename(){return std::string("B");}
};int main()
{std::cout << "This Dome: is_floating_point" << std::endl;bool a;char b;unsigned char c;short d;unsigned short e;int f;unsigned int g;long h;unsigned long i;long long j;unsigned long long k;float l;double m;std::string n;const char* o = "const char";a = false;b = 'a';c = static_cast<unsigned char>(10);d = 11;e = 12;f = 1;g = 2;h = 3;i = 4;j = 5;k = 6;l = 7.0f;m = 8.0;n = "std::string";// Step1:if(std::is_floating_point<void>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<bool>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<short>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<unsigned short>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<int>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<unsigned int>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<long>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<unsigned long>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<long long>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<unsigned long long>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<float>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<double>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<std::string>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<const char*>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}// Step2:if(std::is_floating_point<decltype (a)>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype (b)>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype (c)>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype (d)>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype (e)>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype (f)>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype (g)>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype (h)>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype (i)>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype (j)>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype (k)>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype (l)>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype (m)>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype (n)>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype (o)>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}// 判断函数的返回值的类型if(std::is_floating_point<decltype(void_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(bool_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(char_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(uchar_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(short_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(ushort_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(int_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(uint_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(long_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(ulong_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(longlong_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(ulonglong_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(string_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(const_char_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}// 函数指针if(std::is_floating_point<decltype(std::declval<A>().void_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(std::declval<A>().bool_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(std::declval<A>().char_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(std::declval<A>().uchar_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(std::declval<A>().short_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(std::declval<A>().ushort_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(std::declval<A>().int_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(std::declval<A>().uint_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(std::declval<A>().long_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(std::declval<A>().ulong_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(std::declval<A>().longlong_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(std::declval<A>().ulonglong_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(std::declval<A>().string_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}if(std::is_floating_point<decltype(std::declval<A>().const_char_print())>::value){std::cout << __LINE__ << ": is floating point type " << std::endl;}else{std::cout << __LINE__ << ": isn't floating point type" << std::endl;}return 0;
}

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