c++ - What is the meaning of :: when nothing is prefixed to it? -

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this question has answer here:

i working on project involving sockets , qt. want use socket functions within sys/socket.h , not ones come qt. (this because following tutorial type stuff).

the following code:

if (connect(sock, (const struct sockaddr *) &servaddr, (socklen_t) sizeof(servaddr)) < 0){    //connect server

caused following error:

error: no matching function call 'mainwindow::connect(int&, const sockaddr*, socklen_t)'

i fixed adding :: in front of connect() so:

if (::connect(sock, (const struct sockaddr *) &servaddr, (socklen_t) sizeof(servaddr)) < 0){    //connect server

as understand can use :: prefixed namespace mean in current use? found out how fix error forum post did not explain underlying thought behind it. other tricks using :: .

it means take expression after global scope. see this answer more details.


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