/home/dramalife/note/70-gcc_gnu_compiler_collection/tips/Q_can_define_var_at_header/main.c /home/dramalife/note/70-gcc_gnu_compiler_collection/tips/Q_can_define_var_at_header/functions.c gcc -o a_demo.out /home/dramalife/note/70-gcc_gnu_compiler_collection/tips/Q_can_define_var_at_...
A variable can be declare/define in a C Header without any kind of compilational/ logical errors. But it is against the coding specifications and it is not normally practiced. If proper Multiple inclusion protection macro is used, then there will be no problem even the header is included in...
4); /* Expected result is 5 * 7 = 35 */int32_t x = 5 * (3) + (4); /* It is evaluated to this, final result = 19 which is not what we expect *//* Correct implementation */#define MIN(x, y)
#include"global.h"intglobal_variable=0; 使用单例模式 如果全局变量是一个类的实例,可以使用单例模式来确保只有一个实例存在。单例模式可以确保全局变量只被定义一次,并且可以在程序运行时获取该实例。 例如,在头文件singleton.h中: 代码语言:cpp 复制 ...
#define ek InputSignal(0,0) 5.2使用离散状态执行数字控制律(Implement the digital control law using a discrete state) 您的练习:控制代码应该写在“Update”函数中,因为每个采样周期只调用一次。另一方面,输出“Output”函数通常在每个采样周期调用几次。因此,在输出“Output”函数中计算的任何离散状态(如积分器...
# Sets the name of the path variable. hilog-lib # Specifies the name of the NDK library that # you want CMake to locate. hilog_ndk.z ) target_link_libraries(entry PUBLIC libace_napi.z.so ${hilog-lib} libohweb.so)Node-API层代码/...
如果将任何预处理器指令(例如#include、#define或#pragma)放在预编译头文件的#include之前,则可能会发生此错误。 如果源文件使用预编译头文件(即,如果该文件是使用/Yu编译器选项编译的),则会忽略预编译头文件之前的所有预处理器指令。 此示例无法编译,因为cout和endl是在<iostream>标头中定义的,而该标头包含在预编...
// only do this in one cpp file #define CATCH_CONFIG_MAIN #include "catch.hpp" #include <vector> TEST_CASE("Sum of integers for a short vector", "[short]") { auto integers = {1, 2, 3, 4, 5}; REQUIRE(sum_integers(integers) == 15); ...
// C4996_checked.cpp// compile with: /EHsc /W4 /MDd C4996_checked.cpp#define_ITERATOR_DEBUG_LEVEL 2#include<algorithm>#include<iterator>usingnamespacestd;usingnamespacestdext;intmain(){inta[] = {1,2,3};intb[] = {10,11,12}; ...
__global是限制最少的作用域,__symbolic是限制较多的作用域,而__hidden是限制最多的作用域。 2.3 线程局部存储说明符 通过声明线程局部变量,可以利用线程局部存储。线程局部变量声明由一个标准变量声明外加变量说明符__thread组成。有关更多信息,请参见B.2.146-xthreadvar[=o]。