所有std::variant_size 的特化都满足以某些 N 的std::integral_constant<std::size_t, N> 为基特征的一元类型特征 (UnaryTypeTrait) 。 示例运行此代码#include <any> #include <cstdio> #include <variant> static_assert(std::variant_size_v<std...
3) 满足基特征 (BaseCharacteristic) 为 std::integral_constant<std::size_t, variant_size<T>> 的一元类型特征 (UnaryTypeTrait) 要求辅助变量模板template <class T> inline constexpr std::size_t variant_size_v = std::variant_size<T>::value; (C++17 起) ...
std::variant_size, std::variant_size_v定义于头文件 <variant> template <class T> struct variant_size; /* undefined */ (1) (C++17 起) template <class... Types> struct variant_size<std::variant<Types...>> : std::integral_constant<std::size_t, sizeof...(Types)> { }; (2)...
variant_size_v<std::variant<int, float, double>> == 3); static_assert(std::variant_size_v<std::variant<std::monostate, void>> == 2); static_assert(std::variant_size_v<std::variant<const int, const float>> == 2); static_assert(std::variant_size_v<std::variant<std::variant<...
计算VARIANT 对象的线大小,并获取其句柄和数据。语法C++ 复制 unsigned long VARIANT_UserSize64( [in] unsigned long *unnamedParam1, [in] unsigned long unnamedParam2, [in] VARIANT *unnamedParam3 ); 参数[in] unnamedParam1RPC 使用的数据。
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Reducing the size of test suite using a variant of Non-dominated Sorting Genetic Algorithm IIFor software development life cycle (SDLC) software testing is one of the essential part. The basic objective for software testing is to find the error that is not discovered yet. It also increases ...
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3) 满足基特征为 std::integral_constant<std::size_t, variant_size<T>> 的一元类型特征 (UnaryTypeTrait) 的要求辅助变量模板template <class T> constexpr std::size_t variant_size_v = std::variant_size<T>::value; (C++17 起) 继承自 std::integral_constant 成员常量 value [静态] sizeof.....