- Generated by
1.8.11
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proxygen
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#include <Utility.h>
Initializer lists are a powerful compile time syntax introduced in C++11 but due to their often conflicting syntax they are not used by APIs for construction.
Further standard conforming compilers strongly favor an std::initalizer_list overload for construction if one exists. The following is a simple tag used to disambiguate construction with initializer lists and regular uniform initialization.
For example consider the following case
class Something { public: explicit Something(int); Something(std::intiializer_list<int>);
operator int(); };
... Something something{1}; // SURPRISE!!
The last call to instantiate the Something object will go to the initializer_list overload. Which may be surprising to users.
If however this tag was used to disambiguate such construction it would be easy for users to see which construction overload their code was referring to. For example
class Something { public: explicit Something(int); Something(folly::initlist_construct_t, std::initializer_list<int>);
operator int(); };
... Something something_one{1}; // not the initializer_list overload Something something_two{folly::initlist_construct, {1}}; // correct
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