47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
#ifndef IS_INTEGRAL_HPP
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# define IS_INTEGRAL_HPP
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namespace ft {
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template <class T> struct is_integral
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{
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typedef char yes[1];
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typedef yes no[2];
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static T type;
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// integral types : https://www.cplusplus.com/reference/type_traits/is_integral/
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static yes& test(bool);
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static yes& test(char);
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// static yes& test(char16_t);
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// static yes& test(char32_t);
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static yes& test(wchar_t);
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static yes& test(signed char);
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static yes& test(short int);
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static yes& test(int);
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static yes& test(long int);
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static yes& test(long long int);
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static yes& test(unsigned char);
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static yes& test(unsigned short int);
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static yes& test(unsigned int);
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static yes& test(unsigned long int);
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static yes& test(unsigned long long int);
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// non-template function with direct matching are always considered first
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// then the function template with direct matching are considered
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// https://stackoverflow.com/questions/12877546/how-do-i-avoid-implicit-conversions-on
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template <class C> static no& test(C);
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static const bool value = sizeof(test(type)) == sizeof(yes);
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};
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} // namespace ft
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// "template <>" introduce a total specialization of a template :
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// https://stackoverflow.com/questions/6288812/what-is-the-meaning-of-template-with-empty-angle-brackets-in-c
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// SFINAE : https://jguegant.github.io/blogs/tech/sfinae-introduction.html
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#endif
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