< cpp‎ | language

New overloads. The first one is the one that is much closer to the old syntax: you connect a signal from the sender to a slot in a receiver object. The two other overloads are connecting a signal to a static function or a functor object without a receiver. They are very similar and we will only analyze the first one in this article. ESP-IDF uses kconfiglib which is a Python-based extension to the Kconfig system which provides a compile-time project configuration mechanism. Kconfig is based around options of several types: integer, string, boolean. Kconfig files specify dependencies between options, default values of the options, the way the options are grouped together, etc.

C++

Language
Standard Library Headers
Freestanding and hosted implementations
Named requirements
Language support library
Concepts library(C++20)
Diagnostics library
Utilities library
Strings library
Containers library
Iterators library
Ranges library(C++20)
Algorithms library
Numerics library
Input/output library
Localizations library
Regular expressions library(C++11)
Atomic operations library(C++11)
Thread support library(C++11)
Filesystem library(C++17)
Technical Specifications

Declarations

Overview
declaration syntax
decl-specifier-seq
declarator
Specifiers
virtual function specifier
explicit function specifier
(C++11)
(C++20)
(C++20)
storage class specifiers
(C++11)
(C++11)
(C++11)
elaborated type specifier
attributes (C++11)

Declarators
reference
pointer
array
Block declarations
simple-declaration
→ structured binding declaration(C++17)
alias declaration(C++11)
namespace alias definition
using-declaration
using-directive
static_assert declaration(C++11)
asm-declaration
opaque enum declaration(C++11)
Other declarations
namespace definition
function declaration
class template declaration
function template declaration
explicit template instantiation(C++11)
explicit template specialization
linkage specification
attribute declaration(C++11)
empty declaration

Performs compile-time assertion checking

[edit]Syntax

`static_assert(`bool_constexpr`,`message`)`	(since C++11)
`static_assert(`bool_constexpr`)`	(since C++17)

[edit]Explanation

bool_constexpr	-	a contextually converted constant expression of type bool
message	-	optional (since C++17)string literal that will appear as compiler error if bool_constexpr is false

A static assert declaration may appear at namespace and block scope (as a block declaration) and inside a class body (as a member declaration)

If bool_constexpr returns true, this declaration has no effect. Otherwise a compile-time error is issued, and the text of message, if any, is included in the diagnostic message.

message can be omitted.

(since C++17)

[edit]Note

Since message has to be a string literal, it cannot contain dynamic information or even a constant expression that is not a string literal itself. In particular, it cannot contain the name of the template type argument.

[edit]Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR	Applied to	Behavior as published	Correct behavior
CWG 2039	C++11	only the expression before conversion is required to be constant	the conversion must also be valid in a constant expression

[edit]Example

Static Assertion Failed Signal And Slot Arguments Are Not Compatible Windows 10

Possible output:

[edit]See also

C documentation for static_assert

Retrieved from 'https://en.cppreference.com/mwiki/index.php?title=cpp/language/static_assert&oldid=109785'

< cpp‎ | language

C++

Language
Standard Library Headers
Freestanding and hosted implementations
Named requirements
Language support library
Concepts library(C++20)
Diagnostics library
Utilities library
Strings library
Containers library
Iterators library
Ranges library(C++20)
Algorithms library
Numerics library
Input/output library
Localizations library
Regular expressions library(C++11)
Atomic operations library(C++11)
Thread support library(C++11)
Filesystem library(C++17)
Technical Specifications

Declarations

Overview
declaration syntax
decl-specifier-seq
declarator
Specifiers
virtual function specifier
explicit function specifier
(C++11)
(C++20)
<