小编pdi*_*ddy的帖子

为什么重载被认为是多态的一种形式,或者是实现多态的一种方式.

我的多态性意味着多种形式,我不太明白超载有助于实现这一目标.

我有一个非常简单的CPP类和一个从我的CPP类调用的C函数.此外,我正在使用SWIG生成JAVA和本机之间的粘合代码.

但是当我尝试使用NDK编译它时如果编译失败并出现以下错误:

Android NDK: WARNING: APP_PLATFORM android-19 is larger than android:minSdkVersion 16 in ./AndroidManifest.xml    
[armeabi] Compile++ thumb: swig_module <= swig_wrap.cpp
[armeabi] Compile++ thumb: swig_module <= myclass.cpp
[armeabi] Compile thumb  : swig_module <= test.c
[armeabi] StaticLibrary  : libstdc++.a
[armeabi] SharedLibrary  : libswig_module.so
/Users/xxxxxxx/Documents/Android/adt-bundle-mac-x86_64-20131030/ndk/android-ndk-r9b/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/swig_module/src/myclass.o: in function myclass::foo():jni/src/myclass.cpp:6: error: undefined reference to 'mult(int, int)'
collect2: ld returned 1 exit status
make: *** [obj/local/armeabi/libswig_module.so] Error 1

所以这是代码:

**test.h**
int mult(int a, int b);

**test.c**
#include "test.h"

int mult(int a, int b)
{
    return …

我有以下查询:

DECLARE @sync_table_name nvarchar(500)
SET @sync_table_name = 'ContactTypes'

DECLARE @sync_batch_size bigint
SET @sync_batch_size = 2

DECLARE @sync_last_received_anchor timestamp
SET @sync_last_received_anchor = 1

DECLARE @sync_max_received_anchor timestamp
SET @sync_max_received_anchor = 18732866

DECLARE @sync_new_received_anchor timestamp
DECLARE @sync_batch_count int

DECLARE @sql NVARCHAR(500)
SET @sql = 'SELECT cast([version] as bigint) as [version], ROW_NUMBER() OVER(ORDER BY CAST([version] as BIGINT)) as RowNumber 
INTO #Temp FROM '+@sync_table_name+' WHERE [version] > @min AND [version] <= @max ORDER BY [version];  

SET @batchCountOUT = (SELECT COUNT(*) FROM #Temp) / @batchSize; 
IF …

我对内存管理有点失落.我已经读过你应该在你分配的时候发布.但是当你得到一个没有alloc的实例时,你就不应该发布.

这种情况怎么样,只需要知道我是否正确编码.我仍然是iphone dev的新手.

我有一个CustomerRepository类,它有一个方法

- (MSMutableArray *) GetAllCustomers() {

  MSMutableArray *customers = [[MSMutableArray alloc] init];

  Customer *cust1 = [[Customer alloc] init];
  cust1.name = @"John";

  Customer *cust2 = [[Customer alloc] init];
  cust2.name = @"Tony";

  [customers addOjbect:cust1];
  [customers addOjbect:cust2];

  [cust1 release];
  [cust2 release];

  return customers;

}

然后我有一个UIViewController

- (void) LoadCustomers() {

      CustomerRepository *repo = [[CustomerRepository alloc] init];

      MSMutableArray *customers = [repo GetAllCustomers];          

      // Iterate through all customers and do something

      [repo release];

} 

所以在这种情况下...... MSMutableArray永远不会被释放？它应该在哪里发布？