#pragma warn -rch: This directive hides those warning which are raised when a code is unreachable. For example: any code written after the return statement in a function is unreachable. Example: // Example to explain the working of // #pragma warn directive// This program is compatible with...
#pragma once不是标准，通用性不那么强，但是即使不支持的编译器也仅仅忽略它，不会导致错误，这是标准...
由于在参数声明的时候,__func__还未被定义,前面提到过__func__在函数中的隐式定义。 __func__ usually in function、struct or class body . 三、_Pragma 操作符 在C/C++标准中,#pragma 是一条预处理的指令(preprocessor directive)。简单地说,#pragma 是用来向编译器传达语言标准以外的一些信息。 举个简单...
【说明】:#pragma once并不是C++标准规定的,但是很多编译器都支持它。In the C and C++ programming languages, #pragma once is a non-standard but widely supported preprocessor directive designed to cause the current source file to be included only once in a single compilation. Thus, #pragma once s...
Pragma directives are machine-specific or operating system-specific by definition, and are typically different for every compiler. A pragma can be used in a conditional directive, to provide new preprocessor functionality. Or, use one to provide implementation-defined information to the compiler. ...
Il crée une pragma directive qui supprime un avertissement lorsque l’expression de condition est constante.La définition de macro utilise l’idiome do ... while(0) pour les macros à plusieurs instructions afin qu’elle puisse être utilisée comme s’il s’agissait d’une instruction. ...
使用 從命令行 cl -c -FAs sample.c 編譯下列程序代碼,並查看 sample.asm 它們是否變成 x86 指示 CLI 和 STI:C++ 複製 // pragma_directive_intrinsic.cpp // processor: x86 #include <dos.h> // definitions for _disable, _enable #pragma intrinsic(_disable) #pragma intrinsic(_enable) void f1(...
什么是#pragma once? non-standard but widely supportedpreprocessor directive. Indicate the currentsource fileto be included only once in a single compilation. 什么是preprocessor directive? apreprocessoris aprogramthat processes its input data to produce output that is usedas input to another program. ...
// pragma_directive_float_control.cpp// compile with: /EHa#include<stdio.h>#include<float.h>doublefunc( ){return1.1e75; }#pragmafloat_control (except, on)intmain( ){floatu[1];unsignedintcurrentControl;errno_terr; err = _controlfp_s(¤tControl, ~_EM_OVERFLOW, _MCW_EM);if(err ...
#pragmaruntime_checks("", off )/* runtime checks are off in this region */#pragmaruntime_checks("", restore ) Voir aussi Pragma directives et mots__pragma_Pragmaclés Commentaires Cette page vous a-t-elle été utile ? OuiNon