Template argument deduction In order to instantiate a function template, every template argument must be known, but not every template argument has to be specified. When possible, the compiler will deduce the missing template arguments from the function arguments. ...
The error message looks very clear to me. You mention a class template named Car, but you haven't provided template arguments for it. In other words, there is no class named "Car" in your program - there is an infinite number of classes named Car<int>, Car<long>, Car<std::string>...
:12:5: error: no matching function for call to 'f2' 12 | f2(true); | ^~ :9:6: note: candidate template ignored: constraints not satisfied [with a:auto = bool] 9 | auto f2(auto a) requires ([](auto b){ body }(decltype(a){})){} | ^ :9:27: note: because substituted c...
The substitution of template arguments into a requires-expression can result in the formation of inv...
}template<typenameT>requiresrequires{typenameT::b;}voidfoo(){cout<<"has b"<<endl;}template<...
函数参数的值不能在函数约束中使用。重现问题的一个更简单的方法是：
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1) Template arguments (if any) are substituted into expression; 2) If noexcept is used, expression must not be potentially throwing; 3) If return-type-requirement is present, then: a) Template arguments are substituted into the return-type-requirement; b) decltype((expression)) must satisfy ...
template<bool B> using Requires = std::enable_if_t<B>; /// If any of the given template arguments are ill-formed, then `RequiresValid<...>` /// is also ill-formed. Otherwise, `RequiresValid<...>` is an alias for `void`. /// /// This can be used to define SFINAE-based ...
DeduceTemplateArguments(clang::FunctionTemplateDecl*, clang::TemplateArgumentListInfo*, llvm::ArrayRef<clang::Expr*>, clang::FunctionDecl*&, clang::sema::TemplateDeductionInfo&, bool, llvm::function_ref<bool (llvm::ArrayRef<clang::QualType>)>)::'lambda1'()>(long) SemaTemplateDeduction.cpp:0...