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Medium 9788324662760

Wskaźniki i kod nienadzorowany

Slice ePub May 27, 2014

Jzyk C# obsuguje operacje bezporedniej manipulacji pamici; odbywa si to za porednictwem wskanikw wykorzystywanych w blokach kodu oznaczonych jako niebezpieczne w programach kompilowanych z opcj kompilacji /unsafe. Typy wskanikowe zostay w C# udostpnione gwnie dla potrzeb wci powszechnie stosowanych interfejsw programistycznych API jzyka C, ale mona je te wykorzysta do odwoywania si do pamici poza zarzdzan przez rodowisko stert; wskaniki wykorzystuje si te w kodzie szczeglnie istotnym dla wydajnoci programu.

Dla kadego typu wartociowego albo typu wskanikowego V istnieje odpowiadajcy mu typ wskanikowy V*. Instancja wskanika przechowuje w sobie adres zmiennej w pamici. Typy wskanikowe mona (ale bez osony ze strony mechanizmw nadzorowania wykonania programu) rzutowa na dowolne inne typy wskanikowe. Do najwaniejszych operatorw dla typw wskanikowych zaliczamy:




Operator pobrania adresu, zwracajcy wskanik z adresem zmiennej.


Operator wyuskania, zwracajcy zmienn spod adresu zapisanego we wskaniku.

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Medium 9781576753378


Slice ePub May 14, 2014

We hold these Truths to be self-evident, that all Men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the Pursuit of Happiness.—That to secure these Rights, Governments are instituted among Men, deriving their just Powers from the Consent of the Governed,—That whenever any Form of Government becomes destructive of these Ends, it is the Right of the People to alter or to abolish it, and to institute new Government, laying its Foundation on such Principles, and organizing its Powers in such Form, as to them shall seem most likely to effect their Safety and Happiness.


We, The People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defense, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.

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Medium 9781847772299

Vulture Red Letter Day

Slice PDF February 23, 2015

Medium 9781449396800


Slice ePub May 27, 2014

CRC.arcTo() adds an arc, using two tangent lines and a radius

The coordinates of point P1

The coordinates of point P2

The radius of the circle that defines the arc

This method adds a straight line and an arc to the current subpath and describes that arc in a way that makes it particularly useful for adding rounded corners to polygons. The arc that is added to the path is a portion of a circle with the specified radius. The arc has one point that is tangent to the line from the current position to P1 and one point that is tangent to the line from P1 to P2. The arc begins and ends at these two tangent points and is drawn in the direction that connects those two points with the shortest arc. Before adding the arc to the path, this method adds a straight line from the current point to the start point of the arc. After calling this method, the current point is at the endpoint of the arc, which lies on the line between P1 and P2.

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Medium 9781847771247

A Bivouac

Slice PDF February 17, 2015

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