CODEWITHSUNDEEP
c++templatesreturn-typepartial-specialization
PaulProgrammerNoob
PaulProgrammerNoob

Reputation: 654

Condition in Template Definition

I want to change the return type of a template function depending on a property of the given type. Is there a possibility to do something like this, maybe with partial specialization (one for the cool T and one for not cool ones)?

template<typename T, typename ret = T::IsCool ? int : float>
inline ret get() {}

(It is always guaranteed, that T has the bool property IsCool.)

Upvotes: 4

Views: 170

Answers (1)

Bathsheba
Bathsheba

Reputation: 234705

You can use std::conditional to achieve this.

See http://en.cppreference.com/w/cpp/types/conditional

You can use it like so:

C++11

template<typename T, typename ret = std::conditional<T::IsCool, int, float>::type>
inline ret get() {}

C++14

template<typename T, typename ret = std::conditional_t<T::IsCool, int, float>>
inline ret get() {}

Upvotes: 8

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