[英]No appropriate default constructor available
我收到一條錯誤消息:
SZ_GameItem - 沒有合適的默認構造函數可用。
以下是部分代碼:
主.cpp:
#include <iostream>
#include "SDL.h"
#include "SDL_image.h"
#include "SDL_mixer.h"
using namespace std;
#include "SZ_timer.h"
SZ_Timer aTimer;
const int DELTA_TIME = 10;
bool done = false;
#include "SZ_Player.h"
SZ_Player examplePlayer;
#include "SZ_GameItem.h"
SZ_GameItem exampleItem;
int main(int argc, char *argv[])
{
if (SDL_Init(SDL_INIT_EVERYTHING) < 0);
// Creates the game window
SDL_Window* game_window = SDL_CreateWindow("Rise", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 800, 600, SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE);
// Creates the game render to draw on the game window.
SDL_Renderer* game_renderer = SDL_CreateRenderer(game_window, 0, 0);
// Game Loop
examplePlayer.Init();
while (!done)
{
aTimer.resetTicksTimer();
examplePlayer.Update();
examplePlayer.Input();
exampleItem.Update();
SDL_SetRenderDrawColor(game_renderer, 0, 0, 20, SDL_ALPHA_OPAQUE);
SDL_RenderClear(game_renderer);
examplePlayer.Render(game_renderer);
exampleItem.Render(game_renderer);
SDL_RenderPresent(game_renderer);
// If less time has passed than allocated block, wait difference
if (aTimer.getTicks() < DELTA_TIME)
{
SDL_Delay(DELTA_TIME - aTimer.getTicks());
}
}
SDL_Quit();
// Exits program
return 0;
}
SZ_GameItem.cpp:
#include "SZ_GameItem.h"
SZ_GameItem::SZ_GameItem(int eX, int eY, int eW, int eH)
{
x = eX;
y = eY;
height = eH;
width = eW;
rect.x = x;
rect.y = y;
rect.h = height;
rect.w = width;
velocity.x = 1;
velocity.y = 0;
}
SZ_GameItem::~SZ_GameItem()
{
}
void SZ_GameItem::Input()
{
}
void SZ_GameItem::Update()
{
rect.x = x;
rect.y = y;
rect.h = height;
rect.w = width;
x = x + velocity.x;
y = y + velocity.y;
}
void SZ_GameItem::Render(SDL_Renderer* pRenderer)
{
SDL_SetRenderDrawColor(pRenderer, 255, 255, 255, 255);
SDL_RenderDrawRect(pRenderer, &rect);
}
SZ_GameItem.h:
#ifndef aGameItem
#define aGameItem
#include <iostream>
#include "SDL.h"
#include "SZ_Vector2D.h"
class SZ_GameItem
{
public:
SZ_GameItem(int x, int y, int w, int h);
~SZ_GameItem();
void Update();
void Input();
void Render(SDL_Renderer* aRenderer);
SZ_Vector2D velocity;
int x, y, height, width;
private:
SDL_Rect rect;
};
#endif
當你寫這行時:
SZ_GameItem exampleItem;
您實際上聲明並初始化了一個SZ_GameItem
類型的變量。 在這種情況下, 它使用默認構造函數(即不帶參數) 隱式初始化變量,但您沒有提供。 在某些情況下可以隱式定義默認構造函數,但由於您提供了用戶定義的構造函數,簽名為SZ_GameItem(int x, int y, int w, int h)
, 默認構造函數不是隱式定義的。
需要做的是使用您提供的構造函數自己初始化這個變量,或者提供一個默認的構造函數。
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