{"id":129,"date":"2010-08-04T00:22:30","date_gmt":"2010-08-03T16:22:30","guid":{"rendered":"http:\/\/blog.mega-zone.org\/?p=129"},"modified":"2010-08-04T23:15:59","modified_gmt":"2010-08-04T15:15:59","slug":"%e8%a1%a5%e4%b8%81%e4%b9%9f%e6%9c%89%e8%a1%a5%e5%87%ba%e9%97%ae%e9%a2%98%e7%9a%84%e6%97%b6%e5%80%99","status":"publish","type":"post","link":"https:\/\/blog.mega-zone.org\/?p=129","title":{"rendered":"\u8865\u4e01\u4e5f\u6709\u8865\u51fa\u95ee\u9898\u7684\u65f6\u5019"},"content":{"rendered":"

\u4e0a\u4e00\u7bc7\u63d0\u5230\u7684member-function pointer\u7684\u95ee\u9898\uff0c\u540e\u6765\u53d1\u73b0\u5e76\u4e0d\u662f\u56e0\u4e3a\u4e0d\u540c\u7684\u7f16\u8bd1\u73af\u5883\u9020\u6210\u6307\u9488\u5927\u5c0f\u4e0d\u4e00\u6837\uff0c\u800c\u662f\u56e0\u4e3a\u4e0d\u540c\u7684\u73af\u5883\u4e0b\u7ed3\u6784\u4f53\u7684\u5bf9\u9f50\u89c4\u5219\u51fa\u4e86\u95ee\u9898\u3002<\/p>\n

\u51fa\u95ee\u9898\u7684\u662fvc6.0 sp5\uff0c\u5728\u8fd9\u4e2a\u73af\u5883\u4e0b\uff0c\u5982\u679c\u5b9a\u4e49unknow type\u7684member-function pointer\uff0c\u4f8b\u5982\u8fd9\u6837\uff1a<\/p>\n

class Unkonw; \/\/forward\u00a0declaration\r\n\r\ntypedef void(Unkonw::* MFP)(int param);\r\n\r\nstruct Callback\u00a0{\r\n\r\nchar* szName;\r\n\r\nMFP fp;\u00a0}<\/pre>\n
\u5373\u4f7f\u7f16\u8bd1\u9009\u9879\u91cc\u9762\u6ca1\u6709\u8bbe\u5b9a\u5176\u4ed6\u7684\u5bf9\u5176\u89c4\u5219\uff0c\u4f7f\u7528\u4e86\u9ed8\u8ba4\u76848\u5b57\u8282\u5bf9\u9f50\uff0c\u8fd9\u4e2asizeof(Callback)\u4e5f\u662f32\uff0c\u800c\u4e0d\u662f\u6b63\u5e38\u768424\u3002\u8fd9\u4e2a\u95ee\u9898\u5728\u539f\u59cb\u7684vc6.0\u91cc\u9762\u5e76\u6ca1\u6709\u51fa\u73b0\uff0c\u6253\u4e86sp5\u8865\u4e01\u624d\u4f1a\u51fa\u73b0\u3002\u5982\u679c\u7ee7\u7eed\u5347\u7ea7\u5230sp6\u5c31\u4fee\u590d\u8fd9\u4e2a\u95ee\u9898\u4e86\u3002\u6240\u4ee5\u8bf4\uff0c\u771f\u6b63\u90aa\u6076\u7684\u4e0d\u662fmember-function pointer\uff0c\u800c\u662f\u51fa\u9519\u7684\u7f16\u8bd1\u5668\u624d\u5bf9-_-b<\/p>\n
\u67e5\u95ee\u9898\u7684\u65f6\u5019\uff0c\u6709\u79cd\u5f88\u7b80\u5355\u7684\u8f93\u51fasizeof\u7ed3\u679c\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u505a\u5230\u7f16\u8bd1\u671f\u67e5\u770b\u5bf9\u8c61\u5927\u5c0f\uff0c\u65b9\u6cd5\u662f\uff1a<\/p>\n
template<int s> class TestTSize; <\/pre>\n
\u7136\u540e\u5728\u9700\u8981\u7684\u5730\u65b9\u5199TestSize<sizeof(xxx)>()\u5373\u53ef\u5728\u7f16\u8bd1\u51fa\u9519\u7684\u4fe1\u606f\u91cc\u9762\u770b\u5230\u6c42\u503c\u4ee5\u540e\u7684sizeof\u3002\u8fd9\u4e2a\u6280\u5de7\u8c8c\u4f3c\u5728\u300aModern C++ Design\u300b\u91cc\u9762\u63d0\u5230\u8fc7\u3002\u55ef\u55ef\uff0c\u5f88\u6709\u7528\u7684\u8bf4\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e0a\u4e00\u7bc7\u63d0\u5230\u7684member-function pointer\u7684\u95ee\u9898\uff0c\u540e\u6765\u53d1\u73b0\u5e76\u4e0d\u662f\u56e0\u4e3a\u4e0d\u540c\u7684\u7f16\u8bd1\u73af\u5883\u9020\u6210\u6307\u9488\u5927\u5c0f\u4e0d\u4e00\u6837\uff0c\u800c\u662f\u56e0\u4e3a\u4e0d\u540c\u7684\u73af\u5883\u4e0b\u7ed3\u6784\u4f53\u7684\u5bf9\u9f50\u89c4\u5219\u51fa\u4e86\u95ee\u9898\u3002 \u51fa\u95ee\u9898\u7684\u662fvc6.0 sp5\uff0c\u5728\u8fd9\u4e2a\u73af\u5883\u4e0b\uff0c\u5982\u679c\u5b9a\u4e49unknow type\u7684member-function pointer\uff0c\u4f8b\u5982\u8fd9\u6837\uff1a class Unkonw; \/\/forward\u00a0declaration typedef void(Unkonw::* MFP)(int param); struct Callback\u00a0{ char* szName; MFP fp;\u00a0} \u5373\u4f7f\u7f16\u8bd1\u9009\u9879\u91cc\u9762\u6ca1\u6709\u8bbe\u5b9a\u5176\u4ed6\u7684\u5bf9\u5176\u89c4\u5219\uff0c\u4f7f\u7528\u4e86\u9ed8\u8ba4\u76848\u5b57\u8282\u5bf9\u9f50\uff0c\u8fd9\u4e2asizeof(Callback)\u4e5f\u662f32\uff0c\u800c\u4e0d\u662f\u6b63\u5e38\u768424\u3002\u8fd9\u4e2a\u95ee\u9898\u5728\u539f\u59cb\u7684vc6.0\u91cc\u9762\u5e76\u6ca1\u6709\u51fa\u73b0\uff0c\u6253\u4e86sp5\u8865\u4e01\u624d\u4f1a\u51fa\u73b0\u3002\u5982\u679c\u7ee7\u7eed\u5347\u7ea7\u5230sp6\u5c31\u4fee\u590d\u8fd9\u4e2a\u95ee\u9898\u4e86\u3002\u6240\u4ee5\u8bf4\uff0c\u771f\u6b63\u90aa\u6076\u7684\u4e0d\u662fmember-function pointer\uff0c\u800c\u662f\u51fa\u9519\u7684\u7f16\u8bd1\u5668\u624d\u5bf9-_-b \u67e5\u95ee\u9898\u7684\u65f6\u5019\uff0c\u6709\u79cd\u5f88\u7b80\u5355\u7684\u8f93\u51fasizeof\u7ed3\u679c\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u505a\u5230\u7f16\u8bd1\u671f\u67e5\u770b\u5bf9\u8c61\u5927\u5c0f\uff0c\u65b9\u6cd5\u662f\uff1a template<int s> class TestTSize; \u7136\u540e\u5728\u9700\u8981\u7684\u5730\u65b9\u5199TestSize<sizeof(xxx)>()\u5373\u53ef\u5728\u7f16\u8bd1\u51fa\u9519\u7684\u4fe1\u606f\u91cc\u9762\u770b\u5230\u6c42\u503c\u4ee5\u540e\u7684sizeof\u3002\u8fd9\u4e2a\u6280\u5de7\u8c8c\u4f3c\u5728\u300aModern C++ Design\u300b\u91cc\u9762\u63d0\u5230\u8fc7\u3002\u55ef\u55ef\uff0c\u5f88\u6709\u7528\u7684\u8bf4\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[12],"_links":{"self":[{"href":"https:\/\/blog.mega-zone.org\/index.php?rest_route=\/wp\/v2\/posts\/129"}],"collection":[{"href":"https:\/\/blog.mega-zone.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.mega-zone.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.mega-zone.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.mega-zone.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=129"}],"version-history":[{"count":7,"href":"https:\/\/blog.mega-zone.org\/index.php?rest_route=\/wp\/v2\/posts\/129\/revisions"}],"predecessor-version":[{"id":136,"href":"https:\/\/blog.mega-zone.org\/index.php?rest_route=\/wp\/v2\/posts\/129\/revisions\/136"}],"wp:attachment":[{"href":"https:\/\/blog.mega-zone.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=129"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.mega-zone.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=129"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.mega-zone.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=129"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}