我有一个相当基本的问题。假设我有一个模板化函数:
bool is_max(std::uint32_t val) {
return (val == std::numeric_limits<uint32_t>::max());
}
Run Code Online (Sandbox Code Playgroud)
但是,为了使我的功能灵活,我想使用模板:
template <typename T>
bool is_max(T val) {
return (val == ???);
}
Run Code Online (Sandbox Code Playgroud)
std::numeric_limits 函数适用于内置类型,但显然不适用于用户定义类型。
是否有一些当前内置和大多数数字类型(我正在尝试使用cnl::fixed_point)的标准运算符或函数可用于此处查找最小值/最大值?
我想创建一个define constant that is assigned to one of multiple other具有最大值的定义常量.就像是:
`define MAXWIDTH $MAX(`WIDTH0,`WIDTH1,`WIDTH2)
Run Code Online (Sandbox Code Playgroud)
这在Verilog/SystemVerilog中是否可行?
我正在编写一个数据包处理器并具有以下类:
class Parser {
private:
Packet* curr_pkt;
public:
void parsePacket(unsigned char byte) {
if(byte == SyncPacket::headerVal) {
SyncPacket pkt;
curr_pkt = &pkt;
}
if(byte == SyncPacket::headerVal) {
TypeAPacket pkt;
curr_pkt = &pkt;
}
}
};
class Packet {
public:
void parseByte(unsigned char byte) {}
};
class SyncPacket : public Packet {
public:
static const unsigned char headerVal = 0x0A;
void parseByte(unsigned char byte) {
<do sync>
}
};
class TypeAPacket : public Packet {
public:
static const unsigned char headerVal …Run Code Online (Sandbox Code Playgroud) 以下代码: https: //godbolt.org/z/eYEdTnMqc
#include<memory>
#include<vector>
#include<string>
class Base {
protected:
std::string type;
};
class Derived1 : public Base{
protected:
bool status;
public:
Derived1(): status(false), type("Derived1") {}
void setStatus(bool newStatus) {
status = newStatus;
}
bool getStatus() {
return status;
}
};
int main() {
std::vector<std::shared_ptr<Base>> vars;
vars.push_back(std::make_shared<Derived1>());
if(!vars.back()->getStatus()) {
vars.back()->setStatus(true);
}
}
Run Code Online (Sandbox Code Playgroud)
给我这个编译错误:
Could not execute the program
Compiler returned: 1
Compiler stderr
<source>: In constructor 'Derived1::Derived1()':
<source>:13:32: error: class 'Derived1' does not have any field named 'type'
13 | …Run Code Online (Sandbox Code Playgroud)