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better to_string test

master
Daniel Kolesa 2015-07-11 19:54:51 +01:00
parent 2c09fc968f
commit 5f083f2b67
1 changed files with 8 additions and 7 deletions
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15
octa/string.hh
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@ -479,15 +479,16 @@ AnyString<A> concat(std::initializer_list<T> v, const S &sep = " ") {
namespace detail {
template<typename T>
struct ToStringTest {
template<typename U, String (U::*)() const> struct Test {};
template<typename U> static char test(Test<U, &U::to_string> *);
template<typename U> static int test(...);
static constexpr bool value = (sizeof(test<T>(0)) == sizeof(char));
};
auto test_tostring(int) ->
decltype(IsSame<decltype(declval<T>().to_string()), String>());
template<typename>
False test_tostring(...);
template<typename T>
static True test_iterable(decltype(octa::iter(declval<T>())) *);
using ToStringTest = decltype(test_tostring<T>(0));
template<typename T>
True test_iterable(decltype(octa::iter(declval<T>())) *);
template<typename> static False test_iterable(...);
template<typename T>