Can You Explicitly Specify Template Parameters for C Constructors?

Explicitly Specifying Constructor Template Parameters

In C , constructors can be defined as template functions to allow for generic object initialization. However, the compiler typically infers the template parameters based on the constructor arguments provided at the call site.

Is Explicit Specification Possible?

A frequently asked question is whether it's possible to explicitly specify the template parameters of a constructor. Unfortunately, the answer is no, according to the C 03 standard:

Standard Compliance:

The C 03 standard explicitly states that:

"There is no way to provide an explicit template argument list for conversion member function templates and constructor member function templates."

Implications for Usage:

This limitation has implications for situations where the compiler fails to identify the correct templated constructor. Explicit template parameter specification could potentially generate more informative error messages or even resolve the issue. However, this option is not available in C 03.

Alternatives:

In the absence of explicit template parameter specification, alternative approaches include:

• Providing more specific constructor type annotations
• Using compiler flags to control template argument deductions
• Explicitly specifying the class template name and template parameters before the constructor call

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