在 C 中呼叫建構函式時可以明確指定模板參數嗎？

Explicit Template Parameter Specification in Constructor Invocation

In object-oriented programming using C++, a constructor is a special member function that initializes an object. While constructors can be defined as templates, allowing for generic initialization behavior, it's often desirable to explicitly specify the template parameters during constructor invocation.

A class called A serves as a simple example:

struct A {
   template<typename T>
   A() {}
};

The code above defines a template constructor that accepts a generic data type T. However, when invoking this constructor, the compiler typically relies on type deduction from the arguments provided. The question arises: is there a way to explicitly specify the constructor's template parameters?

Unfortunately, the answer is no. According to the C++03 standard, "there is no way to provide an explicit template argument list for these function templates." This is because the explicit template argument list follows the function template name, and conversion member function templates and constructor member function templates are called without using a function name.

Note: This behavior may differ in newer versions of C++. Consult the standard or documentation for the specific version of C++ you are using to verify.

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