noexcept operator （C++11 起）

 

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C + +语言

大会的主题 Original: General topics The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
预处理器 评论 关键字	ASCII表 转义序列 C + +的历史
流量控制 Original: Flow control The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
条件执行语句 Original: Conditional execution statements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
if statement	switch statement
迭代语句 Original: Iteration statements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
for loop range-for loop （C++11）	while loop do-while loop
跳转语句 Original: Jump statements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
continue statement break statement	goto statement return statement
功能 Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
函数声明
lambda函数的声明
函数模板
的历史。内嵌说明
异常规范 （过时了）
noexcept说明 （C++11）
例外 Original: Exceptions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
扔表达	try-catch块
命名空间 Original: Namespaces The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
命名空间声明	命名空间的别名
类型 Original: Types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
基本类型 复合类型 枚举类型	联合类型 函数类型
decltype specifier （C++11）
规范 Original: Specifiers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
CV符
存储时间说明符
constexpr说明 （C++11）
汽车符 （C++11）
alignas说明 （C++11）
初始化 Original: Initialization The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
默认的初始化 值初始化 零初始化 复制初始化 直接初始化	集合初始化 表初始化 （C++11） 常数初始化 参考电压的初始化

常 Original: Literals The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
整数文字 字符文字 浮点文字 字符串文字	布尔文字 nullptr （C++11） 用户定义的 （C++11）
表达式 Original: Expressions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
价值类型 为了评价	运营商 运算符的优先级
另一种表示形式
实用工具 Original: Utilities The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
类型 Original: Types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
typedef declaration
声明类型别名 （C++11）
属性 （C++11）
施放 Original: Casts The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
隐式转换
const_cast conversion
static_cast conversion
dynamic_cast conversion
reinterpret_cast conversion
C-风格和功能转换
内存分配 Original: Memory allocation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
new expression	delete expression
类 Original: Classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
类的声明 this pointer 访问符	朋友说明 初始化列表
类特定的功能特性 Original: Class-specific function properties The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
虚函数 覆盖说明 （C++11） 最后说明 （C++11）	明确的 （C++11） 静态的
特殊的成员函数 Original: Special member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
默认构造函数 拷贝构造函数 移动的构造函数 （C++11）	复制的任务 移动分配 （C++11） 析构函数
模板 Original: Templates The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
类模板
函数模板
模板特化
参数包 （C++11）
杂项 Original: Miscellaneous The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
内联汇编

 

noexcept运营商进行编译时检查，返回true，如果一个表达式被宣布为不抛出任何异常.

Original:

The noexcept operator performs a compile-time check that returns true if an expression is declared to not throw any exceptions.

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它可以用来在一个函数模板的<div class="t-tr-text"> noexcept说明

Original:

noexcept specifier

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声明该函数将抛出异常，对于某些类型，但不是别人.

Original:

It can be used within a function template's

noexcept说明

Original:

noexcept specifier

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</div> to declare that the function will throw exceptions for some types but not others.

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语法

noexcept( expression )

返回对象类型bool

Original:

Returns an object of type bool.

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解释

noexcept运营商不评估expression。 false如果expression包含以下可能评价的构造中的至少一个的结果是：

Original:

The noexcept operator does not evaluate expression. The result is false if the expression contains at least one of the following potentially evaluated constructs:

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• 打电话给任何类型的功能，没有抛出异常规范，除非它是一个<div class="t-tr-text"> 常量表达式

  Original:

  constant expression

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  .
  Original:

  call to any type of function that does not have non-throwing exception specification, unless it is a

  常量表达式

  Original:

  constant expression

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  </div>.

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• throw表达

  Original:

  throw expression

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• dynamic_cast表达时的转换需要一个运行时检查

  Original:

  dynamic_cast expression when the conversion needs a run time check

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• typeid表达时的参数类型是多态类的类型

  Original:

  typeid expression when argument type is polymorphic class type

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在所有其他情况下，结果是true.

Original:

In all other cases the result is true.

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关键字

noexcept

为例

template <class T>
void self_assign(T& t) noexcept(noexcept(T::operator=)) 
{ // self_assign is noexcept if and only if T::operator= is noexcept
    t = t;
}

另请参阅

noexcept说明	需要一个函数不抛出任何异常（C++11） Original: requires a function to not throw any exceptions （C++11） The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
异常规范	指定什么异常被抛出的功能（过时了） Original: specifies what exceptions are thrown by a function （过时了） The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.