Use of non-type template parameters (nontype template parameters) in C + +

Non-type template parameters (nontype template parameters), you can use an integral type (integral type), a pointer (pointer), or a reference (reference);

The argument (argument) of a bound untyped integer parameter (nontype integral parameter) must be a constant expression (constant expression, constexpr);

You cannot bind a normal local object or a dynamic object or a referenced untyped parameter by using a global type.

For a class template (class template), the non-type template parameters are written, see: Http://en.cppreference.com/w/cpp/language/class_template

The following example contains a common notation for template types as integers, pointers, references, function pointers;

Note that pointers and referenced arguments are global variables;

The code is as follows:

=====================================//Name:CppPrimer.cpp//author:caroline//Version:1
      
.0//Description:example, UTF-8//=====================================/*eclipse CDT, gcc 4.8.1*/  
      
#include <iostream> #include <vector> #include <cstring> using namespace std;  
    Integer template template<unsigned N, unsigned m> bool Compare (const char (&AMP;P1) [N], const char (&AMP;P2) [M]) {  
    Std::cout << "Size: << N <<" "<< M << Std::endl;  
Return strcmp (P1, p2); }//pointer template<const char* c> void Pointert (const char* str) {std::cout << C << ""  
<< str << Std::endl; }//reference Template<char (&ra) [9]> void Referencet (const char* str) {std::cout << ra <&l T  
"" << str << Std::endl; } char ca[] = "Caroline"; Initialize pointer char cr[9] = "Caroline"; Initialize the reference, Contains a trailing symbol void F (const char* c) {std::cout << C << Std::endl;}  
function pointer template<void (*F) (const char*) > void Fpointert (const char* c) {F (c); int main (void) {if (compare ("Caroline", "Wendy")) {std::cout << "Caroline is long." &L  
    t;< Std::endl;  
    else {std::cout << "Wendy is long." << Std::endl; //cannot use local variable or dynamic variable as template parameter pointert<ca> ("Wendy"); Pointer referencet<cr> ("Wendy"); Quoting Fpointert<f> ("Caroline Wendy");  
function pointer return 0; }

Output:

Size:9 6  
Caroline is long.  
Caroline Wendy  
Caroline Wendy  
Caroline Wendy

Author: csdn Blog spike_king

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