本文将带您深入了解C++11 static_assert以及它与Boost库的关联,从入门到精通。...二、C++11 static_assert的基本介绍2.1 语法C++11中引入了static_assert关键字,用于在编译期间进行断言,因此也被称为静态断言。...其语法如下:static_assert(常量表达式, "提示字符串")如果第一个参数常量表达式的值为false,编译器将产生一条编译错误,错误位置就是该static_assert语句所在行,第二个参数就是错误提示字符串...; // 错误,value不是常量表达式三、static_assert的常见应用场景3.1 类型检查在模板编程中,static_assert常用于确保模板参数满足特定的类型要求。...3.2 常量表达式检查static_assert可以用于确保某个常量表达式的值符合预期。
C++23 引入了一项重要的语言特性变更,即在 static_assert 和 if constexpr 中允许窄化按语境转换为 bool。...背景与动机在 C++17 之前,static_assert 和 if constexpr 的条件表达式要求严格遵循布尔上下文,不允许隐式地将非布尔类型(如整数或枚举类型)转换为布尔值。...例如,以下代码在 C++17 中会导致编译错误:templatevoid fun(){ static_assert(N, "Nope"); // 错误:N 不能隐式转换为...例如,上述代码在 C++23 中可以正常编译:templatevoid fun(){ static_assert(N, "Nope"); // C++23 允许:N...总结C++23 中引入的窄化布尔转换特性,使得 static_assert 和 if constexpr 的使用更加灵活和自然。这一改进不仅简化了代码,还使编译器的行为与标准保持一致。
T.150: Check that a class matches a concept using static_assert T.150:用static_assert检查类和概念的匹配性 Reason...implementation file, let the compiler check the desired properties of X: 在某处,在实现文件中也可以,让编译器检查X的期望属性: static_assert...(Default_constructible); // error: X has no default constructor static_assert(Copyable);
static_assert(0 == std::rank_v); static_assert(0 == std::rank_v); static_assert(1 == std::...rank_v); static_assert(0 == std::rank_v); static_assert(1 == std::rank_v); static_assert...(1 == std::rank_v); static_assert(2 == std::rank_v); static_assert(2 == std::rank_v...); static_assert(3 == std::rank_v); 数组的维度,这玩意和向量的秩英文名一样啊。。
#include #include static_assert(std::is_same_v); static_assert(typeid...(int) == typeid(int)); static_assert(typeid(int) == typeid(const int)); static_assert(not std::is_same_v...); static_assert(typeid(int) == typeid(const int&)); static_assert(not std::is_same_v
image-20231213140920353 2.1 static_assert /** * static_assert - check integer constant expression at...build time * * static_assert() is a wrapper for the C11 _Static_assert, with a * little macro magic...__static_assert(expr, ##__VA_ARGS__, #expr) #define __static_assert(expr, msg, ...)..._Static_assert(expr, msg) 函数名称:static_assert 文件位置:include/linux/build_bug.h 函数解析:该宏定义主要用来 在编译时检查常量表达式...:表示编译失败后,要打印的错误信息 _Static_assert:C11中引入的关键字,用于判断表达式expr并打印错误信息msg。
return false; } static_assert(not if_hell(false, false)); static_assert(not if_hell(false, true)); assert...(throws([]{ if_hell(true, false)); })); static_assert(if_hell(true, true)); [[nodiscard]] constexpr...return true; } static_assert(not if_heaven(false, false)); static_assert(not if_heaven(false, true))...; assert(throws([]{ if_heaven(true, false)); })); static_assert(if_heaven(true, true)); 别写if_hell这种面条
()); static_assert(month(11) == thanksgiving.month()); static_assert(day(25) == thanksgiving.day(...就是简单的接口用编译期测试来组合,尽可能constexpr,然后直接static_assert测试 #include #include #include <...(accumulate_string_digits("") == 0); static_assert(accumulate_string_digits("1") == 1); static_assert...(accumulate_string_digits("12345") == 15); static_assert(accumulate_string_digits("1a23c45c") == 15);...static_assert(accumulate_string_digits("Hello, World!")
= 'D') return false; } else { static_assert(true, "should not reach...= 'B') return; } else { static_assert(true, "should...= answers[9]) return; } else { static_assert(true...= 'D') return; } else { static_assert(true, "should...= 1) return; } else { static_assert(true, "should
out_ptr and inout_ptr 帮助指示指针所有权 P1132 加上 ranges::starts_withand ranges::ends_with让string操作更流畅 P1659 让static_assert...= 0) if constexpr(flags & Flags::Exec) static_assert(bool(N)); static_assert(N); static_assert(N...= 0); static_assert(N % 4); Concurrency TS:又开始了, P1121 and P1122 hazard pointers read-copy-update...HasAButNotB); // as expected static_assert(HasAButNotB); // as expected static_assert(!...HasAButNotB); // as expected static_assert(HasAButNotB); // ...oops!
其基本语法如下:static_assert(Condition, Message)其中,Condition是在编译时可以确定的常量表达式,Message是当Condition为false时编译器输出的错误信息...使用静态断言可以确保在编译时就发现类型不匹配的问题:template class Container { static_assert(std::is_integral...约束模板参数:在模板编程中,静态断言可以用来约束模板参数,确保它们满足特定的条件:template class E { static_assert(std::is_base_of...更多使用实例以下是一些更多的使用实例:检查编译环境:static_assert(sizeof(void *) == 4, "64-bit code generation is not supported...::is_integral::value, "T must be an integral type");}在这两个函数模板中,static_assert用于检查传入的类型是否为整数类型。
}; int f(int, short, float); static_assert(is_same_v); using Arg2Type...>::type; }; int f(int, short, float); static_assert(is_same_v::type, float>..., short, float)>::type, float>); static_assert(is_same_v...::type, float>); static_assert(is_same_v::type, float...>); static_assert(is_same_v::type, float>); static_assert
([]{ return std::integral; }.operator()()); struct f { auto foo() -> void; }; static_assert...(names_a_type); static_assert(!...names_a_type); template auto do_something() { static_assert(...(not fooable); struct foo1 { void foo(int, short); }; static_assert(fooable); struct foo2...{ void foo(int, auto); }; static_assert(fooable); 视频 C++ Weekly - Ep 319 - A JSON To C++ Converter
示例代码以下是一些使用 std::remove_cvref 的示例:#include #include int main() { static_assert...(std::is_same_v, int>); static_assert(std::is_same_v, int>); static_assert(std::is_same_v, int>); static_assert(std..., int[2]>); static_assert(std::is_same_v, int[2...]>); static_assert(std::is_same_v, int(int)>); std::cout << "All
在 C++的世界里,静态断言(static_assert)是一个强大且极具价值的工具,它为开发者提供了在编译期进行条件检查的能力,对提升代码的健壮性、可维护性和正确性有着至关重要的作用。...(N >= 5, “Array size must be at least 5”); // 函数的其他代码 } 在上述代码中, static_assert 确保了传入的数组大小至少为 5,如果不满足这个条件...例如: cpp 复制 void calculateArea(int length, int width) { static_assert(length > 0 && width > 0, “Length...(N > 0, “Array size must be greater than 0”); T data[N]; public: // 类的其他成员函数 }; 在上述代码中, static_assert...例如,我们可以使用静态断言来检查 int 类型的大小是否符合我们的预期: cpp 复制 static_assert(sizeof(int) == 4, “int size is not 4 bytes
代码示例:templatestruct static_assert_fail { static_assert(B, "Condition is false");};int main...() { static_assert(1 == 1, "One equals one"); // 正确,编译通过 static_assert_fail();...错误信息难以理解:使用static_assert时,可以提供第二个参数作为错误消息,帮助理解为什么断言失败。3. 如何选择:assert vs.
InetAddress::InetAddress(uint16_t port, bool loopbackOnly, bool ipv6) { static_assert(offsetof(InetAddress..., addr6_) == 0, "addr6_ offset 0"); static_assert(offsetof(InetAddress, addr_) == 0, "addr_ offset...做了测试, static_assert(sizeof(InetAddress) == sizeof(struct sockaddr_in6), "InetAddress is...0"); static_assert(offsetof(sockaddr_in6, sin6_family) == 0, "sin6_family offset 0"); static_assert(...offsetof(sockaddr_in, sin_port) == 2, "sin_port offset 2"); static_assert(offsetof(sockaddr_in6, sin6
// size: 4b => size: 8b // -------- // size: 8b }; static_assert...(12 == sizeof(unpacked)); static_assert(8 == sizeof(packed)); struct simple { int a; // size: 4b...(12 == sizeof(unpacked)); static_assert(not is_packed_layout_v); static_assert(8 == sizeof...(packed)); static_assert(is_packed_layout_v); static_assert(1 == sizeof(empty)); static_assert...(is_packed_layout_v); static_assert(4 == sizeof(simple)); static_assert(is_packed_layout_v<simple
#include #define FWD(x) std::forward(x) #define typed_static_assert(x) static_assert...auto additionnable2 = is_valid((x, y), x + y); constexpr auto has_meow = is_valid((x), x.meow()); static_assert...(additionnable1(a, b)); static_assert(!...additionnable1(a, c)); static_assert(additionnable1(c, c)); static_assert(!...additionnable2(c, a)); static_assert(has_meow(cat)); static_assert(!
.> SetName(string name) && { static_assert(utils::pack<Tags......move(folderPath); return {move(m_data)}; } Configuration Build() && { static_assert...= -1, "'SetName' is mandatory"); static_assert(utils::pack); static_assert(std::totally_ordered); static_assert(std::totally_ordered...>); static_assert(not std::totally_ordered>)